Final answer:
4 members of the 20-member city council voted in favor of the new tax, which is 20% of the total members.
Step-by-step explanation:
The question requires a simple percentage calculation to determine how many members of the city council voted in favor of the new tax. Since 20% of the 20-member council voted for the tax, you multiply 20% (or 0.20) by 20 to find the number of voting members. Thus, the calculation is:
0.20 × 20 = 4
Therefore, 4 members of the city council voted in favor of the new tax.