Are you saying you want to set up the shipping so that:
Product A is $2.50
Product B is $1.75
Product C is $7.75

and if a customer orders:
Product A Qty 3 the shipping is 3 x 2.50
Product B Qty 1 the shipping is 1 x 1.75
Product C Qty 2 the shipping is 2 x 7.75

for total shipping of $24.75 ...