Pierre saved $8 each day and Wendy saved $
c more than Pierre each day. After 4 weeks, they were still short of $32 to buy a laptop.
- How much did the laptop cost? Express your answer in terms of c.
- If c = $8, how much did the laptop cost?
(a)
Amount Pierre saved per day = $8
Amount Wendy saved per day = $(8 +
c)
Total amount both saved per day
= 8 + 8 +
c = $(16 +
c)
Number of days in 4 weeks
= 4 x 7
= 28
Total both saved in 4 weeks
= 28(16 +
c)
= 28 x 16 + 28 x
c = $(448 + 28
c)
Cost of the laptop
= 448 + 28
c + 32
= 448 + 32 + 28
c= $(480 + 28
c)
(b)
If
c = $8,
Cost of the laptop
= 480 + 28 x 8
= 480 + 224
= $704
Answer(s): (a) $(480 + 28
c) or $(28
c + 480); (b) $704
