PSLE The airmail rates to two countries are shown. Victoria sent a letter weighing 74g to Thailand and a letter weighing 20g to China by airmail. How much did she pay altogether?
Mass |
Thailand |
China |
First 30g |
$0.75 |
$1.10 |
Every additional 15g |
$0.45 |
$0.45 |
Mass of the letter to Thailand excluding the first 30 g
= 74 - 30
= 44 g
Sets of additional 15 g of the letter to Thailand
= 44 ÷ 15
= 2 r 14
Sets of additional 15 g and part thereof the letter to Thailand
= 2 + 1
= 3
Amount that Victoria paid for the letter to Thailand
= 0.75 + 3 x 0.45
= 0.75 + 1.35
= $2.10
Amount that Victoria paid altogether
= 2.10 + 1.10
= $3.20
Answer(s): $3.20