At a bookstore, post-it pads are sold at $9 for 1 post-it pad. For every 5 post-it pads a customer pays, an extra post-it pad will be given free.
- How much will Mrs Loh pay for 13 post-it pads?
- What is the most number of post-it pads Mr Ma can get for $97?
(a)
Number of post-it pads in one set
= 5 + 1
= 6
Cost of a set of 6 post-it pads
= 5 x 9
= $45
Number of sets
= 13 ÷ 6
= 2 r 1
Amount that Mrs Loh paid
= 2 x 45 + 1 x 9
= 90 + 9
= $99
(b)
Maximum number of sets
= 97 ÷ 45
= 2 r 13
Number of post-it pads that can be bought with remaining money
= 13 ÷ 9
= 2
Maximum number of post-it pads
= 6 x 2 + 2
= 14
Answer(s): (a) $99; (b) 14