Question

Please answer this three sums ​

Answer 1

$\huge\bold\red{Solution}$

1.) • ( n - 1) x 100 = rt

n = Number of times the amount will become in t years at r% per annum SIMPLE INTEREST.

Apply to given problem :-

n = 3, r = 10, t = ?

( 3 - 1 ) x 100 = 10 x t

t = 200/10 = 20 Years




3.) Let the C.P of pencil be x rupees.

Now C.P of 1 pencil = (x/6) rupees

Now , S.P of 5 pencil = x rupees

S.P of one pencil = (x/5) rupees

Now gain = S.P - C.P = (x/5 - x/6)

6x - 5x / 30 = (x/30) rupees

Gain% = gain / cp * 100

= (x/30x) * 100

= 10/3%

Sorry mate i am not able to solve second question plzz forgive me .