PSLE The airmail rates to two countries are shown. Raeann sent a letter weighing 86g to Laos and a letter weighing 36g to India by airmail. How much did she pay altogether?
Mass |
Laos |
India |
First 40g |
$0.95 |
$1.90 |
Every additional 20g |
$0.65 |
$0.75 |
Mass of the letter to Laos excluding the first 40 g
= 86 - 40
= 46 g
Sets of additional 20 g of the letter to Laos
= 46 ÷ 20
= 2 r 6
Sets of additional 20 g and part thereof the letter to Laos
= 2 + 1
= 3
Amount that Raeann paid for the letter to Laos
= 0.95 + 3 x 0.65
= 0.95 + 1.95
= $2.90
Amount that Raeann paid altogether
= 2.90 + 1.90
= $4.80
Answer(s): $4.80