The usual price of a stapler sold at Shop S and T is $12. During a sale, a discount of 25% is given to every stapler sold at Shop S. At Shop T, a discount of 50% is given to the 4th stapler for every 4 staplers sold. How much cheaper would it be if Julie buys 10 staplers from Shop S instead of Shop T?

	Shop S	Shop T
Price of 1 stapler	75%  $9	100% $12
Every 4th stapler		50% $6

Price of 1 stapler from Shop S in percentage
= 100% - 25%
= 75%

Price of 1 stapler from Shop S at 25% discount
= 75% x 12
= ⁷⁵₁₀₀ x 12 
= $9

Cost of 10 staplers from Shop S
= 10 x 9
= $90

Price of the 4th stapler from Shop T in percentage
= 100% - 50%
= 50%

Cost of 4th stapler at Shop T
= 50% x 12
= ⁵⁰₁₀₀ x 12 
= $6

Cost of 1 set of 4 staplers at Shop T
= 12 x 3 + 6
= $42

Number of sets of 4 for staplers at Shop T
= 10 ÷ 4
= 2 r 2

Cost of 2 sets of 4 staplers at Shop T
= 2 x 42
= $84

Cost of 2 staplers at Shop T
= 2 x 6
= $12

Cost of 10 staplers at Shop T
= 84 + 12
= $96

Amount cheaper if Julie buys 10 staplers from Shop S instead of Shop T
= 96 - 90
= $6

Answer(s): $6