diff in loss and profit %'s is = 5-(-10)=15%
15% of C.P is=75
ergo, C.P=$ 500
I din't really understand the solution.
Maybe u can explain............
Assume he bought the chair for price x. He sells it at a loss of 10% i.e for 0.9x.
If he had sold for 5% profit, price would have been 1.05x. ($75 is the profit, not price of chair)
1.05x - 0.9x = 75
0.15x = 75