Question

after allowing a discount of 12% on the Marked price of keeper still gains 21% by what percent is the Marked price above cost price​

Answer 1

let assume cost price as 100
then sellung price is 121 after getting discount
$121 \times \frac{100}{88} = 137.5$
now we get marked price as 137.5
so there is 37.5 % increase in cost price