OK, let me phrase it differently. I'm assuming a straight line chart. On day 1, the business takes in 0, but spends $2000. On day 2, the business takes in 1/90th of $2000 ($22.20), but spends $2000. On day 3, the business takes in 2/90ths of $2000 ($44.40), but spends $2000. Day 4 is spending 3/90ths ($66.60) but spends $2000. By the 90th day, the business spends $2000 and takes in $2000.
So, the business has spent $180,000, but how much has it taken in?
Gigabuist, I just typed the above before you posted. There must be an equation so that I can vary the number of days, etc. I'm writing out equations on paper, and coming really close, but no cigar. It's driving me nuts.