Pencentages

2008-04-21 1:28 am

數學勁既唔該幫我計下呀，要埋式THX
1)Jeffrey borrows $75 000 from a finance company at %12 p.a. simple interest
rate. He must pay back the amount within 30 days. If the payment is overdue, the interest after 30 days will be calcilater at a simple interest rate of20%p.a. How much will he need to pay if he pays back the amount 40 days after
borrowing? Give the answer correct to the nearest dollar.(Take 1 year = 365
days.)
2)Marco deposits $18 000 in a bank at an interest rate of 8%p.a. hor 18
months. Find the interest if it is compounded
(a) half-yearly, (b)mounthly.

回答 (1)

[匿名]

2008-04-21 8:12 am

✔ 最佳答案

1) Amount needed to be paid
=$75000 + $75000*12%/365*30 + $75000*20%/365*10
=$76151
2)(a) Interest = $18000*[1+8%/2]^3-$18000 = $2248
(b) Interest = $18000*[1+8%/12]^18-$18000 = $2287

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