Answer:
a) 20%
b) 400%
Step-by-step explanation:
In a) you firts do
$310000=100% what about $62000.Then cross multiply
$62000×100%=6200000÷310000=20%
In b) you first do
$62000=100% what about $248000.Then cross multiply
$248000×100=$24800000÷62000=400%