PSLE The airmail rates to two countries are shown. Anna sent a letter weighing 68g to Thailand and a letter weighing 28g to Australia by airmail. How much did she pay altogether?
Mass |
Thailand |
Australia |
First 30g |
$0.55 |
$1.30 |
Every additional 15g |
$0.25 |
$0.55 |
Mass of the letter to Thailand excluding the first 30 g
= 68 - 30
= 38 g
Sets of additional 15 g of the letter to Thailand
= 38 ÷ 15
= 2 r 8
Sets of additional 15 g and part thereof the letter to Thailand
= 2 + 1
= 3
Amount that Anna paid for the letter to Thailand
= 0.55 + 3 x 0.25
= 0.55 + 0.75
= $1.30
Amount that Anna paid altogether
= 1.30 + 1.30
= $2.60
Answer(s): $2.60