Book Maths Puzzle Percentage

If there are 2,347,690 employees this year and it is a 43.7 percent increase from the previous year. What was the former number of employees?

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Book Other Question

A person invested $2,000, part at 7% and part at 8% simple interest. If the total yearly interest from these investments was $154, how much was vested at each rate? How many gallons of a 70% alcohol solution must be mixed with 30 gallons of a 15% alcohol solution to obtain a solution that is 60% alcohol? When solving the equation e to the power of x = -2 can we write x = ln(-2) ?