Question

The cost price of an article is $63. This represents 20% of the selling price.
Calculate the selling price before taxes.

Answer 1

cost price = 20% of selling price
63 = 20% of selling price
turn 20% into a decimal = 0.2
" of " means multiply
let selling price be represented by x
so now we have :
63 = 0.2x -- divide both sides by 0.2
63/0.2 = x
315 = x

check..
63 = 0.2(315)
63 = 63 (correct)

so your selling price is $315