A calculator manufacturing company checks 500caculator u it's 25 of them have no Fu cyikming keys
The percentage of calculators with no functioning keys is calculated by dividing the number of calculators with no functioning keys by the total number of calculators and then multiplying by 100.
Percentage of calculators with no functioning keys = (25/500) x 100 = 5%
Therefore, 5% of the calculators manufactured by the company have no functioning keys.