The usual price of a pen sold at Shop F and G is $36. During a sale, a discount of 25% is given to every pen sold at Shop F. At Shop G, a discount of 50% is given to the 6th pen for every 6 pens sold. How much cheaper would it be if Nicole buys 14 pens from Shop F instead of Shop G?

	Shop F	Shop G
Price of 1 pen	75%  $27	100% $36
Every 6th pen		50% $18

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

Price of 1 pen from Shop F at 25% discount
= 75% x 36
= ⁷⁵₁₀₀ x 36 
= $27

Cost of 14 pens from Shop F
= 14 x 27
= $378

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

Cost of 6th pen at Shop G
= 50% x 36
= ⁵⁰₁₀₀ x 36 
= $18

Cost of 1 set of 6 pens at Shop G
= 36 x 5 + 18
= $198

Number of sets of 6 for pens at Shop G
= 14 ÷ 6
= 2 r 2

Cost of 2 sets of 6 pens at Shop G
= 2 x 198
= $396

Cost of 2 pens at Shop G
= 2 x 18
= $36

Cost of 14 pens at Shop G
= 396 + 36
= $432

Amount cheaper if Nicole buys 14 pens from Shop F instead of Shop G
= 432 - 378
= $54

Answer(s): $54