PSLE The airmail rates to two countries are shown. Shannon sent a letter weighing 54g to Vietnam and a letter weighing 16g to China by airmail. How much did she pay altogether?
Mass |
Vietnam |
China |
First 20g |
$0.85 |
$1.40 |
Every additional 10g |
$0.45 |
$0.60 |
Mass of the letter to Vietnam excluding the first 20 g
= 54 - 20
= 34 g
Sets of additional 10 g of the letter to Vietnam
= 34 ÷ 10
= 3 r 4
Sets of additional 10 g and part thereof the letter to Vietnam
= 3 + 1
= 4
Amount that Shannon paid for the letter to Vietnam
= 0.85 + 4 x 0.45
= 0.85 + 1.80
= $2.65
Amount that Shannon paid altogether
= 2.65 + 1.40
= $4.05
Answer(s): $4.05