The usual price of a pen sold at Shop N and P is $20. During a sale, a discount of 20% is given to every pen sold at Shop N. At Shop P, a discount of 40% is given to the 4th pen for every 4 pens sold. How much cheaper would it be if Dana buys 10 pens from Shop N instead of Shop P?
|
Shop N |
Shop P |
Price of 1 pen |
80% $16 |
100% $20 |
Every 4th pen |
|
60% $12 |
Price of 1 pen from Shop N in percentage
= 100% - 20%
= 80%
Price of 1 pen from Shop N at 20% discount
= 80% x 20
=
80100 x 20
= $16
Cost of 10 pens from Shop N
= 10 x 16
= $160
Price of the 4th pen from Shop P in percentage
= 100% - 40%
= 60%
Cost of 4th pen at Shop P
= 60% x 20
=
60100 x 20
= $12
Cost of 1 set of 4 pens at Shop P
= 20 x 3 + 12
= $72
Number of sets of 4 for pens at Shop P
= 10 ÷ 4
= 2 r 2
Cost of 2 sets of 4 pens at Shop P
= 2 x 72
= $144
Cost of 2 pens at Shop P
= 2 x 12
= $24
Cost of 10 pens at Shop P
= 144 + 24
= $168
Amount cheaper if Dana buys 10 pens from Shop N instead of Shop P
= 168 - 160
= $8
Answer(s): $8