Final answer:
John's new weekly salary will be 1.25 times his current salary.
Step-by-step explanation:
To find John's new weekly salary after the raise, we need to add the raise to his current salary. Since the raise is 1/4 of his weekly salary, we can say that the raise is equal to (1/4) * his current salary. Therefore, John's new weekly salary will be his current salary plus the raise: Current Salary + (1/4) * Current Salary.
To simplify this equation, we can rewrite (1/4) as 0.25. Therefore, John's new weekly salary can be calculated as: Current Salary + 0.25 * Current Salary.
Combining like terms, we get John's new weekly salary as: 1.25 * Current Salary.
So, John's new weekly salary will be 1.25 times his current salary. Therefore, the correct answer is c. Twice the current salary.