Calculation the number of units you purchase of these goods and the prices you paid one year ago.

For example: suppose you buy 5 gallons of milk, 4 loaves of bread, 3 gallons of juice, and 2 bars of butter. one year ago, you paid the following price: $2.55 per gallon $2.50 per loaf $3.50 per juice $1.50 per bar The calculation to determine the total spending a month one year age for these goods. Please show the clear / step calculation: