At a stationery shop, staplers are sold at $9 for 1 stapler. For every 7 staplers a customer pays, an extra stapler will be given free.
- How much will Mrs Choo pay for 17 staplers?
- What is the most number of staplers Mr Heng can get for $146?
(a)
Number of staplers in one set
= 7 + 1
= 8
Cost of a set of 8 staplers
= 7 x 9
= $63
Number of sets
= 17 ÷ 8
= 2 r 1
Amount that Mrs Choo paid
= 2 x 63 + 1 x 9
= 126 + 9
= $135
(b)
Maximum number of sets
= 146 ÷ 63
= 2 r 17
Number of staplers that can be bought with remaining money
= 17 ÷ 9
= 2
Maximum number of staplers
= 8 x 2 + 2
= 18
Answer(s): (a) $135; (b) 18