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Answer 1 · 2017-02-25T06:34:38

In this case the total cost is directly proportional to the number of photos developed.

The cost of each photo developed #C# is constant over the full range of the number of photos developed #ND#.

So total the cost #TC# increases directly as the number of photos developed is increased.

#TC = C xx ND#

If you buy only one photo:

#TC = $0.25 xx 1 = $0.25#

If you buy 10 photos:

#TC = $0.25 xx 10 = $2.50#

The total cost #TC# is increasing as the number of photos developed #ND# increases (multiplied by a constant multiplier #C#).

Then #TC# is directly proportional the number of photos developed #ND#.