p value? critical z value? test statistic? help please=(

Critical z value and p value help please?
Use a significant level of a=0.01 to test the claim that p1=p2. use the given sample sizes and numbers of successes to find (a) pool estimated p (b) the z test statistic (c) the critical z values and (d) the p value.

Treatment group Placebo group
n1=500 n2=200
x1=100 x2=50

p=?
z=?
critical z value=?
p-value=?

Let's start with part a)

and then



What do you get?