Lui saved $12 each day and Ivory saved $
s more than Lui each day. After 4 weeks, they were still short of $30 to buy a laptop.
- How much did the laptop cost? Express your answer in terms of s.
- If s = $2, how much did the laptop cost?
(a)
Amount Lui saved per day = $12
Amount Ivory saved per day = $(12 +
s)
Total amount both saved per day
= 12 + 12 +
s = $(24 +
s)
Number of days in 4 weeks
= 4 x 7
= 28
Total both saved in 4 weeks
= 28(24 +
s)
= 28 x 24 + 28 x
s = $(672 + 28
s)
Cost of the laptop
= 672 + 28
s + 30
= 672 + 30 + 28
s= $(702 + 28
s)
(b)
If
s = $2,
Cost of the laptop
= 702 + 28 x 2
= 702 + 56
= $758
Answer(s): (a) $(702 + 28
s) or $(28
s + 702); (b) $758
