PSLE The airmail rates to two countries are shown. Joelle sent a letter weighing 64g to Thailand and a letter weighing 11g to India by airmail. How much did she pay altogether?
Mass |
Thailand |
India |
First 20g |
$0.95 |
$1.90 |
Every additional 10g |
$0.75 |
$0.75 |
Mass of the letter to Thailand excluding the first 20 g
= 64 - 20
= 44 g
Sets of additional 10 g of the letter to Thailand
= 44 ÷ 10
= 4 r 4
Sets of additional 10 g and part thereof the letter to Thailand
= 4 + 1
= 5
Amount that Joelle paid for the letter to Thailand
= 0.95 + 5 x 0.75
= 0.95 + 3.75
= $4.70
Amount that Joelle paid altogether
= 4.70 + 1.90
= $6.60
Answer(s): $6.60