PSLE The airmail rates to two countries are shown. Roshel sent a letter weighing 62g to Laos and a letter weighing 25g to China by airmail. How much did she pay altogether?
Mass |
Laos |
China |
First 30g |
$0.65 |
$1.20 |
Every additional 15g |
$0.35 |
$0.40 |
Mass of the letter to Laos excluding the first 30 g
= 62 - 30
= 32 g
Sets of additional 15 g of the letter to Laos
= 32 ÷ 15
= 2 r 2
Sets of additional 15 g and part thereof the letter to Laos
= 2 + 1
= 3
Amount that Roshel paid for the letter to Laos
= 0.65 + 3 x 0.35
= 0.65 + 1.05
= $1.70
Amount that Roshel paid altogether
= 1.70 + 1.20
= $2.90
Answer(s): $2.90