The New Frontier Consulting Company does an audit at the end of each fiscal year. For the last fiscal year the auditing company gave the following report. Three-fifths of the total income was allowable to be deducted for expenses. On the remaining portion New Frontier had to pay two-fifths of that amount for a business income tax. After deductible expenses & income tax were paid, out of the remaining, one-sixth was used for additional research & development and three-tenths was set aside in a cash reserve. This left each of the four partners $160,000. What was the original income for the New Frontier?

so far I have:

x=audit report

x- 3/5x= 2/5x <-- left after deductible 2/5x(2/5)= 4/25x remains @ this point: 2/5x-4/25x=6/25x <--left after tax i cant figure out what to do for this part: "After deductible expenses & income tax were paid, out of the remaining, one-sixth was used for additional research & development and three-tenths was set aside in a cash reserve."