Question

the cost of a radio is increased from rupees 500 rupees 550 by what percent has the cost been increased

Answer 1

Increase in value =550-500=50
% increase=(50/500)x100=10%

Answer 2

Let the percent of cost increased be x.
Cost of the radio=Rs500
Increased cost=Rs550 550-500=Rs50
Therefore,
50/500×100=10%
The percent increased in cost is 10%.