help me to get problem (a) and (b)

I got answer (a) is 26*10^5 but I am not sure.

please get answer a and b both. thank you.

3. Consider the instructions that can be divided into four classes according to the CPI (class A, B, C, and D). A processor Pl has a clock rate of 2 GHz. The average number of cycles for each instruction class for Pl is as follows: Class CPI on Pi Given a program with a dynamic instruction count of 1.0 x 106 instructions divided into classes as follows: 10% class A, 20% class B, 50% class C, and 20% class D. [4 pts] a. Find the clock cycles required. b. Find the execution time of instructions