Using Wright's learning curve model with coefficients a$-52$ min$/$unit and b$-0\mathrm{.}20$ calculate the

completion time of the n$-2300-$th unit. Calculate how many more units $($An$)$ must be completed so that the

new value of the completion time at n'en$+$An will be $25\%$ lower than its current value at n$=2300$