PSLE The airmail rates to two countries are shown. Lucy sent a letter weighing 101g to Indonesia and a letter weighing 41g to Egypt by airmail. How much did she pay altogether?
Mass |
Indonesia |
Egypt |
First 50g |
$0.65 |
$1.40 |
Every additional 25g |
$0.45 |
$0.40 |
Mass of the letter to Indonesia excluding the first 50 g
= 101 - 50
= 51 g
Sets of additional 25 g of the letter to Indonesia
= 51 ÷ 25
= 2 r 1
Sets of additional 25 g and part thereof the letter to Indonesia
= 2 + 1
= 3
Amount that Lucy paid for the letter to Indonesia
= 0.65 + 3 x 0.45
= 0.65 + 1.35
= $2.00
Amount that Lucy paid altogether
= 2.00 + 1.40
= $3.40
Answer(s): $3.40