At a bookstore, folders are sold at $7 for 1 folder. For every 5 folders a customer pays, an extra folder will be given free.
- How much will Mrs Sih pay for 15 folders?
- What is the most number of folders Mr Ng can get for $95?
(a)
Number of folders in one set
= 5 + 1
= 6
Cost of a set of 6 folders
= 5 x 7
= $35
Number of sets
= 15 ÷ 6
= 2 r 3
Amount that Mrs Sih paid
= 2 x 35 + 3 x 7
= 70 + 21
= $91
(b)
Maximum number of sets
= 95 ÷ 35
= 2 r 15
Number of folders that can be bought with remaining money
= 15 ÷ 7
= 2
Maximum number of folders
= 6 x 2 + 2
= 14
Answer(s): (a) $91; (b) 14