PSLE The airmail rates to two countries are shown. Fiona sent a letter weighing 107g to Phillippines and a letter weighing 45g to Australia by airmail. How much did she pay altogether?
Mass |
Phillippines |
Australia |
First 50g |
$0.95 |
$1.70 |
Every additional 25g |
$0.75 |
$0.65 |
Mass of the letter to Phillippines excluding the first 50 g
= 107 - 50
= 57 g
Sets of additional 25 g of the letter to Phillippines
= 57 ÷ 25
= 2 r 7
Sets of additional 25 g and part thereof the letter to Phillippines
= 2 + 1
= 3
Amount that Fiona paid for the letter to Phillippines
= 0.95 + 3 x 0.75
= 0.95 + 2.25
= $3.20
Amount that Fiona paid altogether
= 3.20 + 1.70
= $4.90
Answer(s): $4.90