At a store, punchers are sold at $9 for 1 puncher. For every 5 punchers a customer pays, an extra puncher will be given free.
- How much will Mrs Seah pay for 14 punchers?
- What is the most number of punchers Mr Yong can get for $138?
(a)
Number of punchers in one set
= 5 + 1
= 6
Cost of a set of 6 punchers
= 5 x 9
= $45
Number of sets
= 14 ÷ 6
= 2 r 2
Amount that Mrs Seah paid
= 2 x 45 + 2 x 9
= 90 + 18
= $108
(b)
Maximum number of sets
= 138 ÷ 45
= 3 r 14
Number of punchers that can be bought with remaining money
= 14 ÷ 9
= 3
Maximum number of punchers
= 6 x 3 + 3
= 21
Answer(s): (a) $108; (b) 21