How is tax calculated in section 80c and is it different for home loan repayment?

How is tax calculated in section 80c and is it different for home loan repayment?
Section 80 C has a cap of Rs. 1,00,000 but the House Loan Repayment qualifies for deduction on interest repayment of upto Rs. 1,50,000 and initial repayment of upto Rs. 1,00,000 (Total of Rs. 2,50,000) which is a part of Section 80 C then how does it fit Section 80 C
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