As of June 30, 2021 (the computation date for the 2022 tax rate), Sanchez Company had a negative balance of $1,110 in its unemployment reserve account in State A. The company's average payroll over the last three 12-month periods amounted to $550,000. The unemployment compensation law of State A provides that the tax rate of an employer who has a negative balance on the computation date shall be 7.2% during the following calendar year. Using the tax rate schedule presented below, compute the following: Reserve Ratio 0.0% or more, but less than 1.0% Contribution Rate 6.7% 1.0% or more, but less than 1.2% 6.4% 1.2% or more, but less than 1.4% 6.1% 1.4% or more, but less than 1.6% 5.8% 1.6% or more, but less than 1.8% 5.5% 1.8% or more, but less than 2.0% 5.2% 2.0% or more, but less than 2.2% 2.2% or more, but less than 2.4% 2.4% or more, but less than 2.6% 4.9% 4.6% 4.3% 2.6% or more, but less than 2.8% 4.0% 2.8% or more, but less than 3.0% 3.7% 3.0% or more, but less than 3.2% 3.4% 3.1% 3.2% or more a. The smallest voluntary contribution that Sanchez Company should make in order to effect a change in its tax rate. b. The amount of the tax savings as a result of the voluntary contribution if Sanchez Company's taxable payroll for 2022 is $640,000.