Book Maths Puzzle Numerical Ability

The radius of a circle is so increased that its circumference increased by10%. The area of the circle then increases by

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area is pie r^2 so the increase in area will be 21%......... formula... 10+10+(10*10/100)
9 years agoHelpfull: Yes(0) No(0)

21%
use the formula of successively increase in radius means a+b+(a*b)/100
9 years agoHelpfull: Yes(0) No(0)

Book Other Question

A merchant buys Rs 20000 worth of goods. On the way 40% of the items are damaged.he is forced to sell them at a 10% loss.What profit %should he make on the rest of the items to make an overall profit of 20% two trains travel in the same direction at 56 km & 29 km per hour and fastest train passes a man in the slower train in 16 seconds. find length of the faster train
option
A.100m B.120m C.150m D.160m E.none