Warren saved $9 each day and Dana saved $
e more than Warren 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 e.
- If e = $11, how much did the laptop cost?
(a)
Amount Warren saved per day = $9
Amount Dana saved per day = $(9 +
e)
Total amount both saved per day
= 9 + 9 +
e = $(18 +
e)
Number of days in 4 weeks
= 4 x 7
= 28
Total both saved in 4 weeks
= 28(18 +
e)
= 28 x 18 + 28 x
e = $(504 + 28
e)
Cost of the laptop
= 504 + 28
e + 30
= 504 + 30 + 28
e= $(534 + 28
e)
(b)
If
e = $11,
Cost of the laptop
= 534 + 28 x 11
= 534 + 308
= $842
Answer(s): (a) $(534 + 28
e) or $(28
e + 534); (b) $842
