Question

Tammy's penny bank is

Answer 1

The piggy bank goes from 30% full to 80% full after adding 400 pennies. This means that 400 pennies equal 50% of the piggy bank (80-30).

Because 400 is half, 800 pennies is the whole amount the piggy bank can hold
(400x2=800).

Hope this helps!

Answer 2

4/5=8/10
400÷8=50
50×10=500-pennies Tammy's bank can hold.