self Maths Puzzle

abhishek purchased 140 shirts and 250 trousers at the rate of rs.450 and rs.550 respectively.what should be the overall average selling price of shirts and trousers so that 40% profit earned?(Round off to next integer) 1)725 2)710 3)720 4)700 5)none of these

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self Other Question

Number of factors of 40^3 - 17^3 - 23^3 ?? a sALESMAN ENTERS THE QUANTITY SOLD nd price into the computer.both the number are two digit numbers.but by mistake both the numbers are entered with there digits interchanged .Due to this mistake ,the total sales value remained the same.i.e. Rs 806 , But the inventory reduced by 36 .
1)what was the actual price per piece ?
2)what was the actual quantity sold?