At a stationery shop, punchers are sold at $7 for 1 puncher. For every 6 punchers a customer pays, an extra puncher will be given free.
- How much will Mrs Ee pay for 18 punchers?
- What is the most number of punchers Mr Chen can get for $116?
(a)
Number of punchers in one set
= 6 + 1
= 7
Cost of a set of 7 punchers
= 6 x 7
= $42
Number of sets
= 18 ÷ 7
= 2 r 4
Amount that Mrs Ee paid
= 2 x 42 + 4 x 7
= 84 + 28
= $112
(b)
Maximum number of sets
= 116 ÷ 42
= 2 r 18
Number of punchers that can be bought with remaining money
= 18 ÷ 7
= 2
Maximum number of punchers
= 7 x 2 + 2
= 16
Answer(s): (a) $112; (b) 16