PSLE The airmail rates to two countries are shown. Xylia sent a letter weighing 72g to Phillippines and a letter weighing 23g to Australia by airmail. How much did she pay altogether?
Mass |
Phillippines |
Australia |
First 30g |
$0.85 |
$1.60 |
Every additional 15g |
$0.55 |
$0.70 |
Mass of the letter to Phillippines excluding the first 30 g
= 72 - 30
= 42 g
Sets of additional 15 g of the letter to Phillippines
= 42 ÷ 15
= 2 r 12
Sets of additional 15 g and part thereof the letter to Phillippines
= 2 + 1
= 3
Amount that Xylia paid for the letter to Phillippines
= 0.85 + 3 x 0.55
= 0.85 + 1.65
= $2.50
Amount that Xylia paid altogether
= 2.50 + 1.60
= $4.10
Answer(s): $4.10