Can someone show me how to figure this out?

Use the formula P=I^ekt


A bacterial culture has an initial population of 10,000. If it's population declines to 7000 in 2 hours, what will it be at the end of 4 hours?Can someone show me how to figure this out?
P = Ie^kt


7000 = 10,000e^(2k)


7000/10,000 = e^(2k)


0.7 = e^(2k)


ln (0.7) = 2k


k = -0.178





P = Ie^kt


P = 10,000e^(4 x -0.178)


P = 10,000(.490)


P = 4900Can someone show me how to figure this out?
it is not clear can you pleas show more detail

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