$5.$ Suppose we are going to make an investment in machinery whose cost is $90,000$ euros and we plan to obtain a return of $20\%,$ that is$,$ we will obtain a profit of $18,000$ euros. Two scenarios are proposed for the financing of this project $($in both cases we understand that all the benefit gained is liquidity$)$:

a$.$ Own financing $70\%-$ External financing $30\%.$ The total cost of external financing: $1,755$ euros. Profit Tax $25\%.$

b$.$ Own financing $20\%-$ Financing from others $80\%.$ The total cost of external financing: $3,960$ euros. Profit Tax $25\%.$

$5\mathrm{.}1$ Based on the information provided and considering this operation in isolation, it analyses which of these two financing options for the project is more interesting for the profitability of the partners and the debt ratio.

$5\mathrm{.}2$ After choosing one of the options, state what specific types of financing you would use. Give examples.