PSLE The airmail rates to two countries are shown. Ivory sent a letter weighing 91g to Indonesia and a letter weighing 41g to Canada by airmail. How much did she pay altogether?
Mass |
Indonesia |
Canada |
First 50g |
$0.65 |
$1.30 |
Every additional 25g |
$0.35 |
$0.55 |
Mass of the letter to Indonesia excluding the first 50 g
= 91 - 50
= 41 g
Sets of additional 25 g of the letter to Indonesia
= 41 ÷ 25
= 1 r 16
Sets of additional 25 g and part thereof the letter to Indonesia
= 1 + 1
= 2
Amount that Ivory paid for the letter to Indonesia
= 0.65 + 2 x 0.35
= 0.65 + 0.70
= $1.35
Amount that Ivory paid altogether
= 1.35 + 1.30
= $2.65
Answer(s): $2.65