Answer:
c. variable product and variable period cost from sales.
Explanation:
Contribution Margin is obtained by subtracting the total variable costs from the sales. This is also known as direct costing. Deducting fixed expenses from the contribution margin yields profit . Contribution margin is used in various ratios such as the contribution margin ratio and break even sales is also determined by using it sometimes. Contribution margin is a tool for managers as sales figures guide cost figures. The variable cost of goods sold varies directly with sales volume and the influence of production on profit is eliminated.by deducting only the variable product costs and not the variable period costs we get gross contribution margin. After deducting the variable period costs we get the contribution margin.
The three key reasons startups require funding are attorney fees, capital investments, and marketing research.
<h3>What is a Start-up?</h3>
A startup is a company that is still in its initial stage of operation. The initial stages of operation require significant investment in attorney fees, Capital investment, and marketing research.
In most cases, a startup is created by one or more entrepreneurs who have a vision or a goal to solve a business problem.
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5 Things to Consider When ChoosingYour Health Coverage
Type of plan and provider network. Do the health care providers, hospitals and pharmacies you prefer fall within the plan's network?
Premiums. How much will you pay per month for coverage?
Deductibles. What is the amount you must pay out of pocket before your coverage kicks in?
Copay or coinsurance
Coverage of Medicines
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For the given question, the summation that represents the money in account is:

The principal amount if compounded annually, the formula that represents the amount to be received after n years is:
where A is the amount received after compounding, P is the principal, r is the rate of interest and t is the tenure.
<h3>Solution:</h3>
Given:
Annual interest rate(r) is 5.5%
Principal is(P) $300
Tenure is(t) 10 years
On substituting the values in the formula 
The amount received after compounding at the end of 1 year will be:

Similarly, the amount to be received after 2 years will be:

The amount received after 10 years will be:
upto 10 years
Therefore the summation that represents the money in account after 10 years is:

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