Math: How do you work this out

Reverse Percentages

These following products have gone through 17.5% VAT, find out how much they cost before that?

Camera - £223.25
Heater - £70.50
Printer - £82.25
Computer - £2115
Dishwasher - £293.75
Sofa - £528.75

Camera: £223.25 / 1.175 = £190.00

Check: 190 + 190 x .175 = 223.25

Solution: Divide the final cost by (1 + the VAT rate)

Camera - 223.25 /1.175 = 190 pounds
Heater - 70.50 /1.175 = 60 pounds
Printer - 82.25 /1.175 = 70 pounds
Computer - 2115 /1.175 =1800 pounds
Dishwasher - 293.75 / 1.175 = 250 pounds
Sofa - 528.75 /1.175 = 450 pounds.

Answers: divide each item by 1.175:

Camera = £190.00
Heater = £60.00
Printer = £70.00
Computer = 1,800.00
Dishwasher = £250.00
Sofa = £450.00