im kinda rusty with math, its been some time since i did this, so id like your help

i need to find the top of the following function:

Y(T)= (c*r^T - 10000)*( (r+0.02)^(50-T) )

c is starting cash, and r is interest, both are known

anyone know how to solve this one? really cant remember how its done...... thnx in advance

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