How to figure out the shaded area of this question

50 points~ ! i have to turn this in tomarrow

Acompany made a profit of 75000 over a period of 6 years on an initial investment of 15000 what is the annual roi

Plz answer asap! i will reward brainliest and 12 points for these three questions!take notice: these three questions are completely different! 1) what is the percentage of sugar in the syrup made of 10 kg of water and 4 kg of suugar? 2) what was the original price if after 10% discount it became $450? 3) at first a price was decreased by 12%, then it was disounted again by an additional 5%. what is the percent of the total discount? , and remeber i will award brainliest and 12 points!