PSLE The airmail rates to two countries are shown. Hazel sent a letter weighing 54g to Thailand and a letter weighing 15g to Canada by airmail. How much did she pay altogether?
Mass |
Thailand |
Canada |
First 20g |
$0.75 |
$1.50 |
Every additional 10g |
$0.35 |
$0.45 |
Mass of the letter to Thailand excluding the first 20 g
= 54 - 20
= 34 g
Sets of additional 10 g of the letter to Thailand
= 34 ÷ 10
= 3 r 4
Sets of additional 10 g and part thereof the letter to Thailand
= 3 + 1
= 4
Amount that Hazel paid for the letter to Thailand
= 0.75 + 4 x 0.35
= 0.75 + 1.40
= $2.15
Amount that Hazel paid altogether
= 2.15 + 1.50
= $3.65
Answer(s): $3.65