Asked by zizi

Two years ago, Kim Ean invested RM P in her account which earns r% simple interest. After 18 months, she noticed that the amount had become RM 10,450 and today, the amount is RM 10,600. Find the value of r.
Answered by oobleck
Since the interest appears to be applied monthly, use 1/12 the annual rate. After n months,
A = P(1 + n*r/12100)
Now use the given data
P(1+18r/1200) = 10450
P(1+24r/1200) = 10600
Dividing #2 by #1, we have
(1+24r/1200)/(1+18r/1200) = 10600/10450
r = 3%
Answered by Zizi
Two years ago, Khaled invested RM P in his account which earns r% simple interest.
After eighteen months, he noticed that the amount had become RM10450 and today the
amount is RM 10600. Find the value of P and r.
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