PSLE The airmail rates to two countries are shown. Kimberly sent a letter weighing 72g to Thailand and a letter weighing 36g to China by airmail. How much did she pay altogether?
Mass |
Thailand |
China |
First 40g |
$0.65 |
$1.80 |
Every additional 20g |
$0.25 |
$0.70 |
Mass of the letter to Thailand excluding the first 40 g
= 72 - 40
= 32 g
Sets of additional 20 g of the letter to Thailand
= 32 ÷ 20
= 1 r 12
Sets of additional 20 g and part thereof the letter to Thailand
= 1 + 1
= 2
Amount that Kimberly paid for the letter to Thailand
= 0.65 + 2 x 0.25
= 0.65 + 0.50
= $1.15
Amount that Kimberly paid altogether
= 1.15 + 1.80
= $2.95
Answer(s): $2.95