PSLE The airmail rates to two countries are shown. Sabrina sent a letter weighing 107g to Thailand and a letter weighing 49g to Canada by airmail. How much did she pay altogether?
Mass |
Thailand |
Canada |
First 50g |
$0.95 |
$1.80 |
Every additional 25g |
$0.65 |
$0.70 |
Mass of the letter to Thailand excluding the first 50 g
= 107 - 50
= 57 g
Sets of additional 25 g of the letter to Thailand
= 57 ÷ 25
= 2 r 7
Sets of additional 25 g and part thereof the letter to Thailand
= 2 + 1
= 3
Amount that Sabrina paid for the letter to Thailand
= 0.95 + 3 x 0.65
= 0.95 + 1.95
= $2.90
Amount that Sabrina paid altogether
= 2.90 + 1.80
= $4.70
Answer(s): $4.70