PSLE The airmail rates to two countries are shown. Linda sent a letter weighing 79g to Phillippines and a letter weighing 37g to Australia by airmail. How much did she pay altogether?
Mass |
Phillippines |
Australia |
First 40g |
$0.85 |
$1.40 |
Every additional 20g |
$0.65 |
$0.60 |
Mass of the letter to Phillippines excluding the first 40 g
= 79 - 40
= 39 g
Sets of additional 20 g of the letter to Phillippines
= 39 ÷ 20
= 1 r 19
Sets of additional 20 g and part thereof the letter to Phillippines
= 1 + 1
= 2
Amount that Linda paid for the letter to Phillippines
= 0.85 + 2 x 0.65
= 0.85 + 1.30
= $2.15
Amount that Linda paid altogether
= 2.15 + 1.40
= $3.55
Answer(s): $3.55