Question

A Sum when reckoned at 7½% per annum amount to ¥3920 in 3 years.Find the sum​

Answer 1

Answer:

3200

Step-by-step explanation:

Given:

Rate , R = 7.5%, Amount, A = 3920 , Time = 3 yrs

Principal sum , P = ?

Simple interest, S.I = (P x T x R) / 100

                               = ( P x 3 x 7.5) / 100

                              = ( P x 3 x 75 )/ 1000

                             = ( 225 P ) / 1000

                              = 9 P / 40

Amount = P + S.I

⇒ 3920 = P + 9P/40

⇒3920 = ( 40P+9P)/40

⇒3920 = 49P/40

⇒(3920 x 40) / 49 = P

⇒ 3200 = P

Principal sum = 3200