PSLE The airmail rates to two countries are shown. Irene sent a letter weighing 80g to Phillippines and a letter weighing 43g to Canada by airmail. How much did she pay altogether?
Mass |
Phillippines |
Canada |
First 50g |
$0.95 |
$1.40 |
Every additional 25g |
$0.65 |
$0.40 |
Mass of the letter to Phillippines excluding the first 50 g
= 80 - 50
= 30 g
Sets of additional 25 g of the letter to Phillippines
= 30 ÷ 25
= 1 r 5
Sets of additional 25 g and part thereof the letter to Phillippines
= 1 + 1
= 2
Amount that Irene paid for the letter to Phillippines
= 0.95 + 2 x 0.65
= 0.95 + 1.30
= $2.25
Amount that Irene paid altogether
= 2.25 + 1.40
= $3.65
Answer(s): $3.65