1.
Mr Chan deposits $x in a bank. If the interest rate is decreased from 4% to 3.25% each year, the simple interest obtained after 15 years will be decreased by $22.5. Find the value of x.
x × (4%-3.25%) ×15 = $22.5 2.
John deposits $50000 in a bank at R% p.a. simple interest for 4 years. If the interest rate is 8.5%p.a. and the period of deposit is 6.5 years, the simple interest obtained will be $2375 less. Find the value of R.
$50000×R%×4 - $50000×8.5%×6.5 = $23753.
Tom deposits $15000 in a bank for 5 years at an interest rate of 4%p.a. Keith deposits a different sum of money in the same bank for 0 years at an interest rate of 10%p.a. If the simple interests they receive are the same, how much does keith deposit?
0 year?
let $x be the amount of money keith deposit
$15000×4%×5 = x × 0 ×10%4.
Mr Lee deposits $18000 in Bank A at an interest rate of 5.5%p.a. At the same time, he deposits $42000 in Bank B at an interest rate of 8.5%p.a. If 2.5 years later the total simple interest that he receives from the two bank is x% of his original principal, find the value of x.
$18000×5.5%×2.5 $42000×8.5%×2.5
= $ ＃ = $※
(＃+※) / 18000+42000 x100% = x%樓主留言：
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