Suppose we have two implementations of the same instruction set architecture. Computer A has a clock cycle time of $250ps[$ps$=$ picosecond $={10}^{-12}sec]$ and a CPI of $2\mathrm{.}0$ for some program, and Computer B has a clock cycle time of $500$ ps and a CPI of $1\mathrm{.}2$ for the same program. Which computer is faster for this program and by how much