At a book shop, highlighters are sold at $6 for 1 highlighter. For every 7 highlighters a customer pays, an extra highlighter will be given free.
- How much will Mrs Sim pay for 17 highlighters?
- What is the most number of highlighters Mr Cheong can get for $143?
(a)
Number of highlighters in one set
= 7 + 1
= 8
Cost of a set of 8 highlighters
= 7 x 6
= $42
Number of sets
= 17 ÷ 8
= 2 r 1
Amount that Mrs Sim paid
= 2 x 42 + 1 x 6
= 84 + 6
= $90
(b)
Maximum number of sets
= 143 ÷ 42
= 3 r 17
Number of highlighters that can be bought with remaining money
= 17 ÷ 6
= 3
Maximum number of highlighters
= 8 x 3 + 3
= 27
Answer(s): (a) $90; (b) 27