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

Sum

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

#### 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