A bakery made 100 donuts and the display case 40/100 were chocolate 3/10 were laced and the rest were cinnamon which fraction of the donut were cinnamon.
30/100
43/100
57/100.
70/100.
30/100 were chocolate
3/10 were laced (which is equivalent to 30/100)
So the total percentage of chocolate and laced donuts is 30/100 + 30/100 = 60/100.
This means that 100% - 60% = 40% of the donuts were cinnamon.
Therefore, the fraction of the donuts that were cinnamon is 40/100, which reduces to 2/5 or 0.4 when expressed as a decimal.
So, the correct answer is 40/100.