PSLE The airmail rates to two countries are shown. Shannon sent a letter weighing 51g to Malaysia and a letter weighing 17g to Canada by airmail. How much did she pay altogether?
Mass |
Malaysia |
Canada |
First 20g |
$0.75 |
$1.10 |
Every additional 10g |
$0.35 |
$0.25 |
Mass of the letter to Malaysia excluding the first 20 g
= 51 - 20
= 31 g
Sets of additional 10 g of the letter to Malaysia
= 31 ÷ 10
= 3 r 1
Sets of additional 10 g and part thereof the letter to Malaysia
= 3 + 1
= 4
Amount that Shannon paid for the letter to Malaysia
= 0.75 + 4 x 0.35
= 0.75 + 1.40
= $2.15
Amount that Shannon paid altogether
= 2.15 + 1.10
= $3.25
Answer(s): $3.25