Question: I don't understand how to solve this question, from my HW. Please explain to me how they find part A) and part B). There is

I don't understand how to solve this question, from my HW.
Please explain to me how they find part A) and part B). There is no normal cost, how do you calculate total crashing cost without normal cost?! I'm so confused.
thanks.
What is the total crashing cost? $500 (Enter your response as a whole number.)
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