I could use some help with understanding this question. 5 stars whoever can help!

For each question, I have to get the result , and understand the formula that should be used and the reasoning behind the calculation used.

1. With a budget of $1000, an average CPC of $2.50, how many clicks can the advertiser receive before their budget is exhausted?

2. With an unlimited budget, an average CPC of $1.00, a CTR of 1.8%, and 60,000 impressions, how much will the advertiser spend?

3. With an average CPC of $2.00, how high does the conversion rate need to be in order to reach a goal CPA of $10?

4. If you have a $3000 budget, your average CPC is $0.50, and your conversion rate is 5%:

A. what is your current CPA?

B. How many conversions can you get for $3000?

5. Assume you buy women's skirts at wholesale for $10, and you resell them online for $50, and you give away free shipping which costs $5, and you want to make $20 per skirt:

A. what should your target CPA be?

B. using the above information and answer with an average CPC of $3, how many clicks can you get before you get a sale?

C. What should be your target conversion rate?