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Material Taken From: Mathematics for the international student Mathematical Studies SL Mal Coad , Glen Whiffen , John Owen, Robert Haese , Sandra Haese and Mark Bruce Haese and Haese Publications, 2004. Math Studies IB Syllabus. Opening Problem. Section 13A - Foreign Exchange .
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Material Taken From:Mathematicsfor the international student Mathematical Studies SLMal Coad, Glen Whiffen, John Owen, Robert Haese, Sandra Haese and Mark BruceHaese and Haese Publications, 2004
Section 13A - Foreign Exchange Vocabulary: • Currency – money • Exchange Rate – establishes a relationship between the value of currencies. These are constantly changing. • Conversion – exchanging/converting currencies. • Commission – amount/percentage made by exchanging agency.
Example 1 A bank exchanges 1 British pound (GBP) for 1.9 Australian dollars (AUD). Convert: a) 40 GBP to AUD b) 500 AUD to GBP
Example 2 The table alongside shows the transfer rates between US dollars (USD) and Swiss francs (CHF), and British pounds (GBP). • Write down the exchange rate from: • CHF to USD • USD to CHF • Convert: • 3000 USD to GBP • 10 000 francs to pounds
Commission • Banks and other currency traders earn a commission for exchanging currency. • commission rate between 0.5% to 3% • a ‘flat fee’ • no commission, but worse exchange rates
You live in the U.S. - this table shows the value of the USD in other currencies:
Example 3 Use the currency conversion table to perform the following: • Convert 4000 USD into Euros. • How much does it cost in US dollars to buy 5000 yen? • How many US dollars can you buy for 2000 Swedish kronor?
Example 4 A bank changes US dollars to other currency at a fixed commission of 1.5%. Max wishes to convert $200 US to baht where $1 US buys 40.23 Thai baht. • What commission is charged? • What does the customer receive?
Example 5 A currency exchange service exchanges 1 euro for Japanese yen with the buy rate 135.69, and sell rate 132.08. Cedric wishes to exchange 800 Euros for yen. • How many yen will he receive? • If the yen in a were exchanged immediately back to Euros, how many Euros would they be worth? • What is the resultant commission on the double transaction? The service buys yen at 135.69 The service sells yen at 132.08
Section 13B – Simple Interest BrainPop.comInterest • Vocabulary: • Borrower • Lender • Principal/Capital – amount borrowed. • Interest • -Simple Interest • -Compound Interest
Simple Interest C = capital r = simple interest rate / per year / decimal n = number of time periods (in years) I = interest
Example 6 Calculate the simple interest on a loan of $8000 at a rate of 7% p.a. over 18 months.
Example 7 How much money has been borrowed if the flat rate of interest is 8% p.a. and the simple interest owed after 4 years is $1600?
Example 8 What flat rate of interest does a bank need to charge so that €5000 will earn €900 simple interest in 18 months?
Example 9 How long will it take $2000 invested at a flat rate of 12.5% p.a. to amount to $3000?
Calculating Repayment • Repayments are often made in regular payments over the length of the loan. • These may be weekly, fortnightly, monthly or another period of time.
Calculating Repayment • Calculate the interest • Calculate the total amount to be repaid (capital + interest) • Calculate the total number of payments • Determine the amount of a regular payment
Example 10 Calculate the monthly repayments on a loan of $23 000 at 8% p.a. flat rate over 6 years.
Homework • 13A.1, pg 422 • #1, 3, 5 • 13A.2, pg 424 • #1, 3, 5 • 13A.3, pg 425 • #1, 3 • 13B.1 ,pg 427 • #1, 3, 5, 7, 9 • 13B.2, pg 430 • #1, 3