Discounted Value of Ordinary Annuity

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Hello I tried to do the problem below, and I'm not sure where my calculations went wrong or my method was incorrect. I would like some assistance.

An annuity pays 1000.00 weekly for 4 years and then 4300.00 weekly for the next 8 years. Determine the discounted value if the interest rate is j52=4.2%.

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I tried both (1+(0.042/52)^(+-52*8) since I wasn't sure what symbol would be there and it didn't work.

Thanks for reading