PSLE The airmail rates to two countries are shown. Natalie sent a letter weighing 75g to Phillippines and a letter weighing 36g to Australia by airmail. How much did she pay altogether?
Mass |
Phillippines |
Australia |
First 40g |
$0.55 |
$1.80 |
Every additional 20g |
$0.15 |
$0.60 |
Mass of the letter to Phillippines excluding the first 40 g
= 75 - 40
= 35 g
Sets of additional 20 g of the letter to Phillippines
= 35 ÷ 20
= 1 r 15
Sets of additional 20 g and part thereof the letter to Phillippines
= 1 + 1
= 2
Amount that Natalie paid for the letter to Phillippines
= 0.55 + 2 x 0.15
= 0.55 + 0.30
= $0.85
Amount that Natalie paid altogether
= 0.85 + 1.80
= $2.65
Answer(s): $2.65