PSLE The airmail rates to two countries are shown. Julie sent a letter weighing 76g to Thailand and a letter weighing 14g to Australia by airmail. How much did she pay altogether?
Mass |
Thailand |
Australia |
First 20g |
$0.85 |
$1.30 |
Every additional 10g |
$0.65 |
$0.35 |
Mass of the letter to Thailand excluding the first 20 g
= 76 - 20
= 56 g
Sets of additional 10 g of the letter to Thailand
= 56 ÷ 10
= 5 r 6
Sets of additional 10 g and part thereof the letter to Thailand
= 5 + 1
= 6
Amount that Julie paid for the letter to Thailand
= 0.85 + 6 x 0.65
= 0.85 + 3.90
= $4.75
Amount that Julie paid altogether
= 4.75 + 1.30
= $6.05
Answer(s): $6.05