we know that
total shoppers=150
Part A
shoppers with computer access at home=47+16=63
we have that
150 represents 100%
so
Applying proportion
Find out how much percentage represents 63
100/150=x/63
solve for x
x=(100/150)*63
x=42%
The answer Part A is 42%
Part B
we have that
shoppers than not have an email account=16+74=90
150 represents 100%
Applying proportion
Find out how much percentage represents 90
100/150=x/90
solve for x
x=(100/150)*90
x=60%
the answer part B is 60%