Perry saved $8 each day and Tiffany saved $
c more than Perry each day. After 5 weeks, they were still short of $30 to buy a mobile phone.
- How much did the mobile phone cost? Express your answer in terms of c.
- If c = $8, how much did the mobile phone cost?
(a)
Amount Perry saved per day = $8
Amount Tiffany saved per day = $(8 +
c)
Total amount both saved per day
= 8 + 8 +
c = $(16 +
c)
Number of days in 5 weeks
= 5 x 7
= 35
Total both saved in 5 weeks
= 35(16 +
c)
= 35 x 16 + 35 x
c = $(560 + 35
c)
Cost of the mobile phone
= 560 + 35
c + 30
= 560 + 30 + 35
c= $(590 + 35
c)
(b)
If
c = $8,
Cost of the mobile phone
= 590 + 35 x 8
= 590 + 280
= $870
Answer(s): (a) $(590 + 35
c) or $(35
c + 590); (b) $870
