please i want the the right answers

Having 1GHz machine, three different compilers are being used with three different classes of instructions: Class A, Class B, and Class C, which require 2, 1 and 4 cycles (respectively). Compiler 1 generates code with 10 Million Class A instructions, 25 Million Class B instructions, and 1 billion Class C instructions. Compiler 2 generates code with 500 Million Class A instructions, 500 Million Class B instructions, and 25 Million Class C instructions. Compiler 2 generates code with 15 Million Class A instructions, 1 billion Class B instructions, and 10 Million Class C instructions. Assignment Requirements: 1- Which sequence will be faster according to execution time, prove it mathematically? 2- Find MIPS for each sequence