PSLE The airmail rates to two countries are shown. Vanessa sent a letter weighing 70g to Phillippines and a letter weighing 30g to New Zealand by airmail. How much did she pay altogether?
Mass |
Phillippines |
New Zealand |
First 40g |
$0.65 |
$1.30 |
Every additional 20g |
$0.35 |
$0.55 |
Mass of the letter to Phillippines excluding the first 40 g
= 70 - 40
= 30 g
Sets of additional 20 g of the letter to Phillippines
= 30 ÷ 20
= 1 r 10
Sets of additional 20 g and part thereof the letter to Phillippines
= 1 + 1
= 2
Amount that Vanessa paid for the letter to Phillippines
= 0.65 + 2 x 0.35
= 0.65 + 0.70
= $1.35
Amount that Vanessa paid altogether
= 1.35 + 1.30
= $2.65
Answer(s): $2.65