A pint is two cups, so per cup the strawberries cost $0.96; 87% of this would be 83.52 cents, which should round to 84 cents. This probably what the problem is looking for, however:
The above calculation doesn't acount for the difference between the dry pint and the liquid pint - the liquid pint is bigger by 16.4% but there is no "dry cup." This would make the cup 43% of a dry pint instead of one half (50%), yielding a cost of 71.83 cents which rounds to 72 cents.
Hope this helps!