discount, demand and profit

Jack, a shop owner, has a regular customer named Krack, who always wants a 10% discount on price and also demands 10% more quantity than what he should get. By how much should jack mark his cost price up to make a net profit of 10%?
a. 30%
b. 33.1%
c. 20%
d. 34.4%

answer

To give 10% discount , Jack shd increase the CP to CP/0.9
To give 10% exatra qty, CP shd be increased to 1.1*CP/0.9
To get a 10% profit, CP shd be increased to 1.1*1.1*CP/0.9

CP shd be increased by d. 34.4%

__________________

n/a

help

you have used very difficult method to solve this problem.Please show some easy steps.

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