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At What Rate, Percent per Year Will a Sum Double Itself in 6 1/4 Years? - Mathematics

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Sum

At what rate, percent per year will a sum double itself in `6 1/4` years?

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Solution

Let P = Rs. 100

∴ Amount = 2 × Rs. 100 = Rs. 200

Interest = A − P

= Rs. 200 − Rs. 100

= Rs. 100

T `=6 1/4` years =`25/4` years

`"R" =(100xx"I")/("P"xx"T")=(100xx100)/(100xx25/4)%=(100xx100)/100xx4/25`

= 16%

Concept: To Find the Principle (P); the Rate Percent (R) and the Time
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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 9 Interest
Exercise 9 (A) | Q 6.2 | Page 106
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