PSLE The airmail rates to two countries are shown. Abi sent a letter weighing 70g to Thailand and a letter weighing 33g to New Zealand by airmail. How much did she pay altogether?
Mass |
Thailand |
New Zealand |
First 40g |
$0.65 |
$1.60 |
Every additional 20g |
$0.45 |
$0.60 |
Mass of the letter to Thailand excluding the first 40 g
= 70 - 40
= 30 g
Sets of additional 20 g of the letter to Thailand
= 30 ÷ 20
= 1 r 10
Sets of additional 20 g and part thereof the letter to Thailand
= 1 + 1
= 2
Amount that Abi paid for the letter to Thailand
= 0.65 + 2 x 0.45
= 0.65 + 0.90
= $1.55
Amount that Abi paid altogether
= 1.55 + 1.60
= $3.15
Answer(s): $3.15