PSLE The airmail rates to two countries are shown. Irene sent a letter weighing 84g to Indonesia and a letter weighing 28g to China by airmail. How much did she pay altogether?
Mass |
Indonesia |
China |
First 30g |
$0.65 |
$1.80 |
Every additional 15g |
$0.35 |
$0.70 |
Mass of the letter to Indonesia excluding the first 30 g
= 84 - 30
= 54 g
Sets of additional 15 g of the letter to Indonesia
= 54 ÷ 15
= 3 r 9
Sets of additional 15 g and part thereof the letter to Indonesia
= 3 + 1
= 4
Amount that Irene paid for the letter to Indonesia
= 0.65 + 4 x 0.35
= 0.65 + 1.40
= $2.05
Amount that Irene paid altogether
= 2.05 + 1.80
= $3.85
Answer(s): $3.85