Hi, I need some help with the below exercise. I can't seem to get the correct NOPAT to start. It should be operating income x (1-tax rate) but that keeps coming up as incorrect.

2015 2014 2013

Net Sales $30,274 $31,821 $30,871

Operating expenses 0.151203717

Cost of sales 15,383 16,447 16,106

Selling, general and administrative expenses 6,182 6,469 6,384

Research, development and related expenses 1,763 1,770 1,715

Total operating expenses 23,328 24,686 24,205

Operating income 6,946 7,135 6,666

Interest expenses and income

Interest expense 149 142 145

Interest income -26 -33 -41

Total interest expense--net 123 109 104

Income before income taxes 6,823 7,026 6,562

Provision for income taxes 1,982 2,028 1,841

Net income including noncontrolling interest $4,841 $4,998 $4,721

Less: Net income attributable to noncontrolling interest 8 42 62

Net income attributable to 3M $4,833 $4,956 $4,659