PSLE The airmail rates to two countries are shown. Penelope sent a letter weighing 86g to Phillippines and a letter weighing 27g to Australia by airmail. How much did she pay altogether?
Mass |
Phillippines |
Australia |
First 30g |
$0.55 |
$1.80 |
Every additional 15g |
$0.35 |
$0.80 |
Mass of the letter to Phillippines excluding the first 30 g
= 86 - 30
= 56 g
Sets of additional 15 g of the letter to Phillippines
= 56 ÷ 15
= 3 r 11
Sets of additional 15 g and part thereof the letter to Phillippines
= 3 + 1
= 4
Amount that Penelope paid for the letter to Phillippines
= 0.55 + 4 x 0.35
= 0.55 + 1.40
= $1.95
Amount that Penelope paid altogether
= 1.95 + 1.80
= $3.75
Answer(s): $3.75