PSLE The airmail rates to two countries are shown. Julie sent a letter weighing 71g to Thailand and a letter weighing 39g to Egypt by airmail. How much did she pay altogether?
Mass |
Thailand |
Egypt |
First 40g |
$0.85 |
$1.50 |
Every additional 20g |
$0.55 |
$0.55 |
Mass of the letter to Thailand excluding the first 40 g
= 71 - 40
= 31 g
Sets of additional 20 g of the letter to Thailand
= 31 ÷ 20
= 1 r 11
Sets of additional 20 g and part thereof the letter to Thailand
= 1 + 1
= 2
Amount that Julie paid for the letter to Thailand
= 0.85 + 2 x 0.55
= 0.85 + 1.10
= $1.95
Amount that Julie paid altogether
= 1.95 + 1.50
= $3.45
Answer(s): $3.45