The owner of a hardware shop charges his customers 19% more than the cost price. If a customer paid Rs 10,115 for a machinery, what was the cost price of the machinery ?
A). Rs. 7200
B). Rs. 8100
C). Rs. 8500
D). Rs. 8800
Rs. 8500
Let the cost price of the machine be x
Therefore, x + 19x/100 = 10115