Question

The city treasury began with $1,100,000 at the beginning of the year. Each day

since, tax revenues have come in at a rate of $12,500 per day. Expenditures
each day average $15,000 per day. The treasury now has less than $1,000,000.
How many days, d, has it been since the beginning of the year?

Answer 1

Net daily change is revenue - expenditures, 12500 - 15000 = -2500.

The overall change in the treasury's funds is 1.1Mil - 1Mil = 100K. To find out how many days, we divide the overall change by the net daily change in revenue: 100K / 2500 = 40 days.