The usual price of a pencil sold at Shop F and G is $20. During a sale, a discount of 20% is given to every pencil sold at Shop F. At Shop G, a discount of 40% is given to the 5th pencil for every 5 pencils sold. How much cheaper would it be if Vanessa buys 14 pencils from Shop F instead of Shop G?

	Shop F	Shop G
Price of 1 pencil	80%  $16	100% $20
Every 5th pencil		60% $12

Price of 1 pencil from Shop F in percentage
= 100% - 20%
= 80%

Price of 1 pencil from Shop F at 20% discount
= 80% x 20
= ⁸⁰₁₀₀ x 20 
= $16

Cost of 14 pencils from Shop F
= 14 x 16
= $224

Price of the 5th pencil from Shop G in percentage
= 100% - 40%
= 60%

Cost of 5th pencil at Shop G
= 60% x 20
= ⁶⁰₁₀₀ x 20 
= $12

Cost of 1 set of 5 pencils at Shop G
= 20 x 4 + 12
= $92

Number of sets of 5 for pencils at Shop G
= 14 ÷ 5
= 2 r 4

Cost of 2 sets of 5 pencils at Shop G
= 2 x 92
= $184

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

Cost of 14 pencils at Shop G
= 184 + 48
= $232

Amount cheaper if Vanessa buys 14 pencils from Shop F instead of Shop G
= 232 - 224
= $8

Answer(s): $8