i need solution for the qs from 1- 4 with the explanition please

A new start-up Ham Radio company in Oklahoma City makes commercial and amateur radio equipment, including receivers, transceivers, antenna tuners, linear amplifiers, and so on. Their taxable income last year was $40,000 due to being in a start-up mode. They have developed a new digital transceiver that supports the C4FM Fusion System technology and is commercially available this year. This new product line is expected to add another $180,009. to taxable income for this year. Based on the information provided determine the followingg Answer questions 1-4 below. (10) HWhat is the effective tax rate on all of last year's taxable income? A. 15% B. 25% 015x 40000 C. 34% D. 39% 2 What is the effective tax rate on all of this year's taxable income? (10) B. 21.8% 21 25a*2200 - 1sy 6a0 60 c. 25.4% 69050 D. 31.5% 22 o000 (10) C What is the incremental tax rate for this year's taxable income? 610 50-6000 180-00 A. 28.8% B. 31.5% C. 35.2% D. 38.7% (10)4 What is the marginal tax rate for this year's taxable income? A. 40% B. 39% C. 38% 422 00000 7 D. 35%