A retailer sold 2 houses at each $10000. On 1st house he got 30% profit and on 2nd house he loss 10% then find his net profit or loss? Choose the correct choice from the following answers:  A) 15%  B) 17%  C) 21%  D) 19%  E) 25%
A = 30%   17% = -10%   profit% = 30-10 + (-300/100)= 
<gadget id="calculator">30-10 + (-300/100)</gadget>
<output>17</output>
17%   Answer is 17%
<result>B</result>
A retailer sold 2 houses at each $10000. On 1st house he got 30% profit and on 2nd house he loss 10% then find his net profit or loss?