Answer:
66
Step-by-step explanation:
Hope this helps, let me know if im correct!
To find a fractional part you can use this basic fraction:

once you insert those parts, just reduce the fraction
part = 35; whole = 90
All you have to do is take the size for every cereal, divide it with its price and you should get your answer as cents. then compare them all and see which one has the lowest price.
* don't forgot to put place holders and add a decimal.