Need to findout number of test cases to acheive this program

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C#2.0

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C#6.0

A bank offers the following mortgage rates:

Term Rate
10 years 3.00%
30 years 4.50%
With the following modifiers based on a customer's credit score:

Credit Score Rate Modifier
300 to 699 2.00%
700 to 799 0.00%
800 to 850 -0.50%
The actual rate for a mortgage is calculated using both the term and the credit score. For example if a person needs a 10 year mortgage and has a credit score of 550 the rate would be: 3% + 2% = 5%. If another person needs the same mortgage but has a credit score of 810, the rate would be 3% - 0.50% = 2.50%.



float calculaterate(int term, int score)

{

float rate = 0;

if (term == 10)

rate = 0.03f;

else if (term == 30)

rate = 0.045f;

if (score >= 800)

return rate - 0.005f;

else if (score >= 700)

return rate;

else if (score >= 300)

return rate + 0.02f;

throw new ArgumentOutOfRangeException();

}

The number of test cases needed to achieve 100% code coverage is

What I have tried:

I rate: 10, score: 300, result:
0.05

rate: 10, score: 700, result:
0.03

rate: 10, score: 850, result:
0.025

rate: 30, score: 300, result:
0.065

rate: 30, score: 700, result:
0.045

rate: 30, score: 850, result: