Daily interest rate = interest/(principal * days) =500/( 1600*7)=4.46%.

Annual interest rate = daily interest rate *365=4.46%*365= 1629.46%.

Has exceeded 36%

(2) Seven-day period, 1000 yuan.

Daily interest rate = interest/(principal * days) =300/( 1000*7)=4.2857%.

Annual interest rate = daily interest rate * 365 = 4.2857% * 365 =156 ` 4.2857%.

Has exceeded 36%

Interest ≤24%, supported by the people's court.

24% & lt； If the interest is less than or equal to 36%, the borrower will pay voluntarily and ask the lender to return it, but the people's court will not support it.

If the interest rate is more than 36%, the interest agreement for the part exceeding 36% is invalid, and the people's court shall support the borrower to request the lender to return the paid interest with the annual interest rate exceeding 36%.

Hope to adopt, please adopt.