PSLE The airmail rates to two countries are shown. Fiona sent a letter weighing 91g to Phillippines and a letter weighing 35g to Australia by airmail. How much did she pay altogether?
Mass |
Phillippines |
Australia |
First 40g |
$0.95 |
$1.20 |
Every additional 20g |
$0.65 |
$0.30 |
Mass of the letter to Phillippines excluding the first 40 g
= 91 - 40
= 51 g
Sets of additional 20 g of the letter to Phillippines
= 51 ÷ 20
= 2 r 11
Sets of additional 20 g and part thereof the letter to Phillippines
= 2 + 1
= 3
Amount that Fiona paid for the letter to Phillippines
= 0.95 + 3 x 0.65
= 0.95 + 1.95
= $2.90
Amount that Fiona paid altogether
= 2.90 + 1.20
= $4.10
Answer(s): $4.10