PSLE The airmail rates to two countries are shown. Min sent a letter weighing 97g to Thailand and a letter weighing 45g to Australia by airmail. How much did she pay altogether?
Mass |
Thailand |
Australia |
First 50g |
$0.55 |
$1.90 |
Every additional 25g |
$0.25 |
$0.85 |
Mass of the letter to Thailand excluding the first 50 g
= 97 - 50
= 47 g
Sets of additional 25 g of the letter to Thailand
= 47 ÷ 25
= 1 r 22
Sets of additional 25 g and part thereof the letter to Thailand
= 1 + 1
= 2
Amount that Min paid for the letter to Thailand
= 0.55 + 2 x 0.25
= 0.55 + 0.50
= $1.05
Amount that Min paid altogether
= 1.05 + 1.90
= $2.95
Answer(s): $2.95