The club shop sold a box of golf b***s for $20.40 .
The shop made a profit of 20% on the cost price.
Calculate the cost price of the golf b***s.
Cost price + .20* Cost price = $20.40
Cost price ( 1 + .20) = $20.40 divide both sides by (1 + .20) = (1.20)
Cost price = $20.40 / 1.20 = $ 17
+1886 
