At a stationery shop, folders are sold at $5 for 1 folder. For every 6 folders a customer pays, an extra folder will be given free.
- How much will Mrs Chia pay for 20 folders?
- What is the most number of folders Mr Leng can get for $111?
(a)
Number of folders in one set
= 6 + 1
= 7
Cost of a set of 7 folders
= 6 x 5
= $30
Number of sets
= 20 ÷ 7
= 2 r 6
Amount that Mrs Chia paid
= 2 x 30 + 6 x 5
= 60 + 30
= $90
(b)
Maximum number of sets
= 111 ÷ 30
= 3 r 20
Number of folders that can be bought with remaining money
= 20 ÷ 5
= 3
Maximum number of folders
= 7 x 3 + 3
= 24
Answer(s): (a) $90; (b) 24