Question 949393
he needs 75 feet of wire.


he gets a partly used spool of wire from the shop.


the spool originally contained 1000 feet of wire, but 1/5 of it had been used.


1/5 of 1000 = 200 which means that 800 feet remained.


he takes 75 feet away from 800 feet.


75/800 = .09375 = 9.375%


he used 9.375% of the partly used spool of wire.