Question

(b) a man buys mangoes from one shop at the rate of 20 per kg., from the second at the rate of 25 per kg., from the third shop at the rate of 30 per kg., from the fourth shop at the rate of 35 per kg., find the average rate in rupees per kg. if he buys mangoes of 10 from each shop. 6 following is the data

Answer 1

Answer:

a=20

d=5

n=10

Sn= n/2 [2a+(n-1)d

= 10/2 [ 2 x 20 + 9 x 5]

= 5(40+45)

= 5 x 95

= 475

he bought mangoes from 10 shops, then average rate is 475/10= 47.5 rs

I hope it would help