Tik Tok, how to calculate seven days without interest?

Tik Tok's 7-day interest-free loan is calculated as follows:

1, get 7% interest-free discount, and after 7 days, choose to pay off the loan in advance, return the loan principal, and not return the loan interest.

2. If the loan days exceed 7 days, no interest will be calculated within 7 days, and the loan days exceed 7 days.

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