PSLE The airmail rates to two countries are shown. Eva sent a letter weighing 76g to Phillippines and a letter weighing 17g to Canada by airmail. How much did she pay altogether?
Mass |
Phillippines |
Canada |
First 20g |
$0.85 |
$1.90 |
Every additional 10g |
$0.45 |
$0.65 |
Mass of the letter to Phillippines excluding the first 20 g
= 76 - 20
= 56 g
Sets of additional 10 g of the letter to Phillippines
= 56 ÷ 10
= 5 r 6
Sets of additional 10 g and part thereof the letter to Phillippines
= 5 + 1
= 6
Amount that Eva paid for the letter to Phillippines
= 0.85 + 6 x 0.45
= 0.85 + 2.70
= $3.55
Amount that Eva paid altogether
= 3.55 + 1.90
= $5.45
Answer(s): $5.45