At a bookstore, notebooks are sold at $6 for 1 notebook. For every 6 notebooks a customer pays, an extra notebook will be given free.
- How much will Mrs Soh pay for 11 notebooks?
- What is the most number of notebooks Mr Chan can get for $130?
(a)
Number of notebooks in one set
= 6 + 1
= 7
Cost of a set of 7 notebooks
= 6 x 6
= $36
Number of sets
= 11 ÷ 7
= 1 r 4
Amount that Mrs Soh paid
= 1 x 36 + 4 x 6
= 36 + 24
= $60
(b)
Maximum number of sets
= 130 ÷ 36
= 3 r 11
Number of notebooks that can be bought with remaining money
= 11 ÷ 6
= 3
Maximum number of notebooks
= 7 x 3 + 3
= 24
Answer(s): (a) $60; (b) 24