PSLE The airmail rates to two countries are shown. Jane sent a letter weighing 75g to Thailand and a letter weighing 10g to India by airmail. How much did she pay altogether?
Mass |
Thailand |
India |
First 20g |
$0.85 |
$1.20 |
Every additional 10g |
$0.65 |
$0.50 |
Mass of the letter to Thailand excluding the first 20 g
= 75 - 20
= 55 g
Sets of additional 10 g of the letter to Thailand
= 55 ÷ 10
= 5 r 5
Sets of additional 10 g and part thereof the letter to Thailand
= 5 + 1
= 6
Amount that Jane paid for the letter to Thailand
= 0.85 + 6 x 0.65
= 0.85 + 3.90
= $4.75
Amount that Jane paid altogether
= 4.75 + 1.20
= $5.95
Answer(s): $5.95