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$25.50 would be the price
-1020
$67. Arithmetic will solve this. x-x*0.2 = 53.6, where x is the original sale price. Simplifying gives x*(1-0.2) - 53.6 or x*(0.8) = 53.6. Dividing the 0.8 through gives x = 67. Finding a reduced price is simply subtracting the original price multiplied by the discount (in fraction form from the original price.
This person is having Diharrea.
Seventy pounds So in the sale the reduced price is £63 which having 10% off makes it 90% of original price. Then to reverse the price divide £63 by 90% which is £70 Check: 10% of £70 is £7 then £70 minus £7 makes £63 Solved !