Question

12. What is 12% of 580 +?= 94
a) 26.4 18 24.4 c)30.4
d)28.4
13. A fruit seller buys apples at that rate of Rs 10 per dozen and sells 10 for Rs 12 .what percent of
profit does he make
a) 44 b) 33 c) 30 d)27
14. What sum of money produces Rs 70 at simple interest at 7% in 4 years
a) 500
b) 250
c) 400
. d) 700
15. What is the length of a bridge which a man riding 20 km an hour can cross in 3 minutes
al 1km
b) 2km
c)1/2 km
d) 3km
​

Answer 1

12.)12%of 580+? = 94or, 12/100×580+? = 94or, 69.6+? = 94or, ? = 94-69.6= 24.4

13.) c.p. of 12 = rs.10 s.p. of 10 = rs. 12 on cross multiplying we get,C.p. = rs10×10= rs.100s.p. = rs12×12= rs. 144so, gain = s.p.-c.p. = 144-100 rs. 44

14.) s.i = rs.70 rate= 7% time = 4years so, P= si×100/r×t and, P = 70×100/7×4 so, P = 250

15.)speed of the man = 20km/hr

time taken 3mins. = 1/20hrs.

distance = 20×1/20

= 1 km