At a store, pens are sold at $10 for 1 pen. For every 5 pens a customer pays, an extra pen will be given free.
- How much will Mrs Ee pay for 9 pens?
- What is the most number of pens Mr Tay can get for $120?
(a)
Number of pens in one set
= 5 + 1
= 6
Cost of a set of 6 pens
= 5 x 10
= $50
Number of sets
= 9 ÷ 6
= 1 r 3
Amount that Mrs Ee paid
= 1 x 50 + 3 x 10
= 50 + 30
= $80
(b)
Maximum number of sets
= 120 ÷ 50
= 2 r 9
Number of pens that can be bought with remaining money
= 9 ÷ 10
= 2
Maximum number of pens
= 6 x 2 + 2
= 14
Answer(s): (a) $80; (b) 14