PSLE The airmail rates to two countries are shown. Zara sent a letter weighing 85g to Phillippines and a letter weighing 38g to Switzerland by airmail. How much did she pay altogether?
Mass |
Phillippines |
Switzerland |
First 40g |
$0.75 |
$1.20 |
Every additional 20g |
$0.45 |
$0.30 |
Mass of the letter to Phillippines excluding the first 40 g
= 85 - 40
= 45 g
Sets of additional 20 g of the letter to Phillippines
= 45 ÷ 20
= 2 r 5
Sets of additional 20 g and part thereof the letter to Phillippines
= 2 + 1
= 3
Amount that Zara paid for the letter to Phillippines
= 0.75 + 3 x 0.45
= 0.75 + 1.35
= $2.10
Amount that Zara paid altogether
= 2.10 + 1.20
= $3.30
Answer(s): $3.30