Question

Find the simple interest, if P=160 Rs, R=10% and Time=1/2 year

Answer 1

Put :-

P = 160

R = 10 p. c. p. a

T = 1/2

In the formula -

S. I = P x R x T / 100

Answer 2

Principal,  P = Rs. 2400

Rate of interest, I = 12%

Time, T =  years
             = 5/2 years

Amount, A  = P ( 1 + TR /100 )

= 2400 x [1 + (5 × 12)/(2 × 100)]

= 2400 × [ ( 100 + 60 )/200 ]

= 2400 × 160 /200

= RS 3120

ATQ, 

1200 + cost of cow = A


Cost of the cow = A - 1200

                         = 3120 -1200
                         
                         = Rs 1920

hope it helps