8-25(1-1/8)=7*8-26
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For a number to be divisible by 10, the last digit must be 0.
Taking unit’s digit: if 2+4 = 10, only then the given sum will be divisible by 10. This is possible only in hexa system(in hexa system the digits are 0, 1, 2, 3, 4 and 5).
Cost price of 400 m of cloth = Rs. 40000
Selling price of 1.5m of cloth = Rs. 200
Selling price of 400 m of cloth = (200/1.5) * 400 =Rs. 53,333.33
Here Selling price is greater than cost price, therefore profit.
%Profit = [(SP-CP)/CP]*100
=[(53333.33-40000)/40000] * 100
= 33.33 %
(1/8)-4 = 84 = 4096
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SP of the book = 400 – discount = 400 – 40 = 360
CP = SP – Profit = 360 – 0.2*CP
1.2*CP = 360
CP = Rs. 300