Please help pleaaaseee it’s a little test but I need help please!!

Ashopper bought a watermelon a pack of napkins and some paper plates in his state there was no tax on food the tax rate on non-food items is 5% the total for the three items he bought was 825 before tags and he paid $0.19 in taxes how much did the watermelon cost

Name the most appropriate metric unit for each measurement like the mass of cow

5/6+7/8what is the answer sealsdbdbshd