Final answer:
Multiplying by 1.45 is the same as increasing by 45%.
Step-by-step explanation:
Multiplying by 1.45 is the same as increasing by 45%.
To find the increase as a percentage, we can subtract 1 from the multiplying factor (1.45) and multiply the result by 100:
(1.45 - 1) x 100 = 0.45 x 100 = 45%.
Therefore, the correct answer is a) 45%.