Two different compilers are being tested for a $500MHz.$ machine with three different classes of instructions: Class A$,$ Class B$,$ and Class C$,$ which require $1,2$ and $3$ cycles $($respectively$).$ Both compilers are used to produce code for a large piece of software.

Compiler $1$ generates code with $5$ billion Class A instructions, $1$ billion Class B instructions, and $1$ billion Class $C$ instructions.

Compiler $2$ generates code with $10$ billion Class A instructions, $1$ billion Class B instructions, and $1$ billion Class $C$ instructions.

Which sequence will be faster according to MIPS?

Which sequence will be faster according to execution time?