Julie has saved $42 out of her goal of $75. To express this portion as a fraction in simplest form, we can set up the ratio of the saved amount to the goal amount: 42/75. To simplify the fraction, we find the greatest common divisor of 42 and 75, which is 3. Dividing both the numerator and denominator by 3 gives us the simplest form: 14/25. To represent this fraction as a percent, we divide the numerator by the denominator and multiply by 100: (14/25) * 100 = 56%. This means Julie has saved 56% of her goal amount.