At a bookstore, correction tapes are sold at $10 for 1 correction tape. For every 6 correction tapes a customer pays, an extra correction tape will be given free.
- How much will Mrs Ng pay for 18 correction tapes?
- What is the most number of correction tapes Mr Chen can get for $132?
(a)
Number of correction tapes in one set
= 6 + 1
= 7
Cost of a set of 7 correction tapes
= 6 x 10
= $60
Number of sets
= 18 ÷ 7
= 2 r 4
Amount that Mrs Ng paid
= 2 x 60 + 4 x 10
= 120 + 40
= $160
(b)
Maximum number of sets
= 132 ÷ 60
= 2 r 18
Number of correction tapes that can be bought with remaining money
= 18 ÷ 10
= 2
Maximum number of correction tapes
= 7 x 2 + 2
= 16
Answer(s): (a) $160; (b) 16