PSLE The airmail rates to two countries are shown. Xuan sent a letter weighing 99g to Thailand and a letter weighing 44g to Egypt by airmail. How much did she pay altogether?
Mass |
Thailand |
Egypt |
First 50g |
$0.75 |
$1.50 |
Every additional 25g |
$0.35 |
$0.55 |
Mass of the letter to Thailand excluding the first 50 g
= 99 - 50
= 49 g
Sets of additional 25 g of the letter to Thailand
= 49 ÷ 25
= 1 r 24
Sets of additional 25 g and part thereof the letter to Thailand
= 1 + 1
= 2
Amount that Xuan paid for the letter to Thailand
= 0.75 + 2 x 0.35
= 0.75 + 0.70
= $1.45
Amount that Xuan paid altogether
= 1.45 + 1.50
= $2.95
Answer(s): $2.95