PSLE The airmail rates to two countries are shown. Xandra sent a letter weighing 58g to Malaysia and a letter weighing 16g to Australia by airmail. How much did she pay altogether?
Mass |
Malaysia |
Australia |
First 20g |
$0.55 |
$1.90 |
Every additional 10g |
$0.25 |
$0.75 |
Mass of the letter to Malaysia excluding the first 20 g
= 58 - 20
= 38 g
Sets of additional 10 g of the letter to Malaysia
= 38 ÷ 10
= 3 r 8
Sets of additional 10 g and part thereof the letter to Malaysia
= 3 + 1
= 4
Amount that Xandra paid for the letter to Malaysia
= 0.55 + 4 x 0.25
= 0.55 + 1.00
= $1.55
Amount that Xandra paid altogether
= 1.55 + 1.90
= $3.45
Answer(s): $3.45