What percent is represented by the shaded area?

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Dean and karlene get paid to write songs. dean is paid a one-time fee of $20 plus $80 per day. karlene is paid a one-time fee of $25 plus $100 per day. write an expression to represent how much a producer will pay to hire both to work the same number of days on a song.

What is the solution to the equation e3x=12? round your answer to the nearest hundredth