Question

A certain sum of money amounts to rs 10080 in 5 years at 8% find the principal

Answer 1

Let P be x.

SI=  P R T/100

10080 - x = x × 5 × 8 /100

⇒ 10080 - x = 2 x /5

⇒ 10080 = 2 x/5 + x

⇒ 10080 = 7 x /5

∴ x = (10080 x 5) /7 = 7200

Answer 2

Answer:

Rs 7200

Step-by-step explanation:

Let us suppose the principle amount be x

The formula for simple interest is

$SI=Prt$

Here, SI = Rs 10080-x, r = 0.08, t = 5, P=x

Substituting the know values

$10080-x=x\cdot0.08\cdot5$

Solve the equation for x

$10080-x=0.4x\\1.4x=10080\\\\x=\frac{10080}{1.4}\\\\x=7200$

Therefore, the principle amount is Rs 7200