Answer:
85%
Step-by-step explanation:
There are 4·5=20 boxes total.
4·4+1=16+1=17 of them are purple
17/20
17/20 as a decimal is 0.85
To convert a decimal into a percent multiply it by 100
0.85·100=85%
4 * 5 = 20 blocks in total
3 blocks uncovered.
so, ( 20 - 3 ) / 20 * 100
= 85%
