Jeremy saved $9 each day and Barbara saved $
h more than Jeremy each day. After 3 weeks, they were still short of $30 to buy a laptop.
- How much did the laptop cost? Express your answer in terms of h.
- If h = $2, how much did the laptop cost?
(a)
Amount Jeremy saved per day = $9
Amount Barbara saved per day = $(9 +
h)
Total amount both saved per day
= 9 + 9 +
h = $(18 +
h)
Number of days in 3 weeks
= 3 x 7
= 21
Total both saved in 3 weeks
= 21(18 +
h)
= 21 x 18 + 21 x
h = $(378 + 21
h)
Cost of the laptop
= 378 + 21
h + 30
= 378 + 30 + 21
h= $(408 + 21
h)
(b)
If
h = $2,
Cost of the laptop
= 408 + 21 x 2
= 408 + 42
= $450
Answer(s): (a) $(408 + 21
h) or $(21
h + 408); (b) $450
