The usual price of a pen sold at Shop V and W is $30. During a sale, a discount of 20% is given to every pen sold at Shop V. At Shop W, a discount of 50% is given to the 6th pen for every 6 pens sold. How much cheaper would it be if Winnie buys 14 pens from Shop V instead of Shop W?

	Shop V	Shop W
Price of 1 pen	80%  $24	100% $30
Every 6th pen		50% $15

Price of 1 pen from Shop V in percentage
= 100% - 20%
= 80%

Price of 1 pen from Shop V at 20% discount
= 80% x 30
= ⁸⁰₁₀₀ x 30 
= $24

Cost of 14 pens from Shop V
= 14 x 24
= $336

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

Cost of 6th pen at Shop W
= 50% x 30
= ⁵⁰₁₀₀ x 30 
= $15

Cost of 1 set of 6 pens at Shop W
= 30 x 5 + 15
= $165

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

Cost of 2 sets of 6 pens at Shop W
= 2 x 165
= $330

Cost of 2 pens at Shop W
= 2 x 15
= $30

Cost of 14 pens at Shop W
= 330 + 30
= $360

Amount cheaper if Winnie buys 14 pens from Shop V instead of Shop W
= 360 - 336
= $24

Answer(s): $24