At a store, staplers are sold at $5 for 1 stapler. For every 5 staplers a customer pays, an extra stapler will be given free.
- How much will Mrs Lu pay for 9 staplers?
- What is the most number of staplers Mr Thia can get for $110?
(a)
Number of staplers in one set
= 5 + 1
= 6
Cost of a set of 6 staplers
= 5 x 5
= $25
Number of sets
= 9 ÷ 6
= 1 r 3
Amount that Mrs Lu paid
= 1 x 25 + 3 x 5
= 25 + 15
= $40
(b)
Maximum number of sets
= 110 ÷ 25
= 4 r 9
Number of staplers that can be bought with remaining money
= 9 ÷ 5
= 4
Maximum number of staplers
= 6 x 4 + 4
= 28
Answer(s): (a) $40; (b) 28