exam Maths Puzzle Numerical Ability

please solve this using quadratic equatin with factoring method

t^2 - t/4 + 1/5 = 0

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exam Other Question

The total profit (in dollars) for sales of x rowing machines is given by
P(x)=-0.2x^2+300x-200. What is the profit if 500 are sold? For what value of x will the profit be at a maximum? In the year 1998, there were -4.57 times 10 to the 7th power- cars in America. The population of America was -2.3 times 10 to the 6th power-. What was the average number of cars per person in America in 1998?
A. 0.5
B. 1.98
C. 5
D. 19.8