Let's say that PS3 sales before PS3 slim = X. We know that Y, which is PS3 sales during PS3 Slim launch = 999% improvement from X = 9.99X + X = 11 X. We know that 11 X = 3 * X360 sales, which means that X = X360 * 3 / 11 or roughly X360 / 3.
The actual number should be X360 / 3.5, but I rounded it up to X360 / 3.5
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Simple Mathematics.
Let's say that PS3 sales before PS3 slim = X.
We know that Y, which is PS3 sales during PS3 Slim launch = 999% improvement from X = 9.99X + X = 11 X.
We know that 11 X = 3 * X360 sales, which means that X = X360 * 3 / 11 or roughly X360 / 3.
The actual number should be X360 / 3.5, but I rounded it up to X360 / 3.5