exam Maths Puzzle Numerical Ability

My answer to the problem stated below 1/10 = 0.1 Am I correct?

Problem:
A couple plans to have 4 children.Assuming the probability of obtaining each sex is 50% (1 in 2), find the probability of the couple getting 4 boys.

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exam Other Question

A manufacturer plans to spend $150,000 on research and development for a new lawn mower and then $200 to manufacture each mower. The formula C= 200n + 150,000 gives the cost in do I need help in solving the question:SOLVE THE LINEAR SYSTEM BY GRAPHING:
Y=3x + y
y=x-2