Answer: 63 computers.
Explanation:
Let 48 computers be 100%.
If the number of computers sold must increase by 30% in the next month, that means they need to sell 100% + 30% = 130%.
48 computers - 100%
x computers - 130%
x = (48 * 130%) / 100% = 62.4 computers ⇒ 63 computers.