PSLE The airmail rates to two countries are shown. Tammy sent a letter weighing 82g to Indonesia and a letter weighing 25g to China by airmail. How much did she pay altogether?
Mass |
Indonesia |
China |
First 30g |
$0.75 |
$1.40 |
Every additional 15g |
$0.45 |
$0.40 |
Mass of the letter to Indonesia excluding the first 30 g
= 82 - 30
= 52 g
Sets of additional 15 g of the letter to Indonesia
= 52 ÷ 15
= 3 r 7
Sets of additional 15 g and part thereof the letter to Indonesia
= 3 + 1
= 4
Amount that Tammy paid for the letter to Indonesia
= 0.75 + 4 x 0.45
= 0.75 + 1.80
= $2.55
Amount that Tammy paid altogether
= 2.55 + 1.40
= $3.95
Answer(s): $3.95