Use the figure to find the value of X?

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

#12 find the value of x. #13 find the value of the variable.

What values of c and d make the equation true?