# Rupees 4000 Amount to Rs.5000 in 8 Years; in What Time Will Rs.2100 Amount to Rs.2800 at the Same Rate? - Mathematics

Sum

Rupees 4000 amount to Rs.5000 in 8 years; in what time will Rs.2100 amount to Rs.2800 at the same rate?

#### Solution

In first case :

A = Rs.5000

P = Rs.4000

I = A − P

= Rs.5000 − Rs.4000

= Rs.1000

T = 8 years

R =(100xx"I")/("P"xx"R")

=(100xx1000)/(4000xx8)

=25/8%

In the second Case :

A = Rs.2800

P = Rs.2100

I = Rs.2800 − Rs.2100 = Rs.700

R = 25/8%

T =(100xx"I")/("P"xx"R")=(100xx700)/(2100xx25/8)

=(100xx700xx8)/(2100xx25)=32/3years

=10 2/3 years

=10 2/3xx12 months = 10 24/3 months

= 10 years 8 months

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 (B) | Q 4 | Page 108