PSLE The airmail rates to two countries are shown. Julie sent a letter weighing 84g to Phillippines and a letter weighing 21g to New Zealand by airmail. How much did she pay altogether?
Mass |
Phillippines |
New Zealand |
First 30g |
$0.75 |
$1.90 |
Every additional 15g |
$0.45 |
$0.75 |
Mass of the letter to Phillippines excluding the first 30 g
= 84 - 30
= 54 g
Sets of additional 15 g of the letter to Phillippines
= 54 ÷ 15
= 3 r 9
Sets of additional 15 g and part thereof the letter to Phillippines
= 3 + 1
= 4
Amount that Julie paid for the letter to Phillippines
= 0.75 + 4 x 0.45
= 0.75 + 1.80
= $2.55
Amount that Julie paid altogether
= 2.55 + 1.90
= $4.45
Answer(s): $4.45