网页What is 50 percent of 70? step 1 Observe the input parameters, values and what to be found. Input values: Relative Percentage = 50. Base Quantity = 70. What to be found: 50/100 x 70 = ? step 2 Write the percentage equation and apply the corresponding values: Quantity = (Relative Percentage / 100) x Base Quantity, = 50/100 x 70.