標題:
Maths`(Simple Interest)10 FUN>
發問:
Plz Show me the steps also, thx*=)1)Wendy has a deposit in a bank. If the simple interest rate is increased from 8%p.a. to 9.5% p.a. , she will get an additional of $62.5 every month. Find the deposit.2) Jeffrey borrows $75000 from a finance company at 12% p.a. simple interest rate. He must pay back the amount... 顯示更多 Plz Show me the steps also, thx*=) 1)Wendy has a deposit in a bank. If the simple interest rate is increased from 8%p.a. to 9.5% p.a. , she will get an additional of $62.5 every month. Find the deposit. 2) Jeffrey borrows $75000 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 30days will be calculated at a simple interest rate of 20% 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. )
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最佳解答:
1)Let x be the deposit x(9.5%)(1/12)-x(8%)(1/12)=62.5 x=50000 2008-02-28 17:52:58 補充： The amount of 30 days: 75000x12%x30/365 =54000/73 the amount of 40 days 54000/73(20%)(10/365)+54000/73 =$744 2008-02-28 17:58:23 補充： sorry，我上面個補充錯左 應該係： the amount of the first 30 days： 75000(1+(12%/265))^30 =$75743.26 The amount at the last 10 days 75743.26x(1+(20%/365))^10 =$76159(to the nearest dollars) 2008-02-28 17:59:48 補充： 真係唔好意思，開頭第一個補充教錯左你， 第二個就應該岩架喇， 如果仲有唔明，可以問我 如有錯誤，請多多指教^^ 多謝發問
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