Risa bought 2 kg of durians at $
a per kg and 4 kg of lemons at $2
a per kg.
- Find the amount that she paid for the fruits in terms of a.
- If a = 7, how much change did Mrs Risa receive if she paid the fruit seller with a $100 note?
(a)
Amount paid for the durians
= 2 x
a = $2
a Amount paid for the lemons
= 4 x 2
a = $8
a Total amount paid for the fruits
= 2
a + 8
a = $10
a (b)
Amount that Mrs Risa paid for the fruits
= 10
a = 10 x 7
= $70
Amount of change that Mrs Risa received
= 100 - 70
= $30
Answer(s): (a) $10
a ; (b) $30