The usual price of a notebook sold at Shop F and G is $24. During a sale, a discount of 25% is given to every notebook sold at Shop F. At Shop G, a discount of 50% is given to the 6th notebook for every 6 notebooks sold. How much cheaper would it be if Hilda buys 16 notebooks from Shop F instead of Shop G?

	Shop F	Shop G
Price of 1 notebook	75%  $18	100% $24
Every 6th notebook		50% $12

Price of 1 notebook from Shop F in percentage
= 100% - 25%
= 75%

Price of 1 notebook from Shop F at 25% discount
= 75% x 24
= ⁷⁵₁₀₀ x 24 
= $18

Cost of 16 notebooks from Shop F
= 16 x 18
= $288

Price of the 6th notebook from Shop G in percentage
= 100% - 50%
= 50%

Cost of 6th notebook at Shop G
= 50% x 24
= ⁵⁰₁₀₀ x 24 
= $12

Cost of 1 set of 6 notebooks at Shop G
= 24 x 5 + 12
= $132

Number of sets of 6 for notebooks at Shop G
= 16 ÷ 6
= 2 r 4

Cost of 2 sets of 6 notebooks at Shop G
= 2 x 132
= $264

Cost of 4 notebooks at Shop G
= 4 x 12
= $48

Cost of 16 notebooks at Shop G
= 264 + 48
= $312

Amount cheaper if Hilda buys 16 notebooks from Shop F instead of Shop G
= 312 - 288
= $24

Answer(s): $24