PSLE The airmail rates to two countries are shown. Julie sent a letter weighing 94g to Vietnam and a letter weighing 31g to India by airmail. How much did she pay altogether?
Mass |
Vietnam |
India |
First 40g |
$0.95 |
$1.80 |
Every additional 20g |
$0.55 |
$0.70 |
Mass of the letter to Vietnam excluding the first 40 g
= 94 - 40
= 54 g
Sets of additional 20 g of the letter to Vietnam
= 54 ÷ 20
= 2 r 14
Sets of additional 20 g and part thereof the letter to Vietnam
= 2 + 1
= 3
Amount that Julie paid for the letter to Vietnam
= 0.95 + 3 x 0.55
= 0.95 + 1.65
= $2.60
Amount that Julie paid altogether
= 2.60 + 1.80
= $4.40
Answer(s): $4.40