Sine is also known as Opposite over hypotenuse.
First, find the total number of students. There are 60 students total in the class. Now, do 18/60. This is .3. From here, multiply that by 100. 30% of students chose vanilla cupcakes. Hope this helped!
Answer:
Interest wil be 10% of 100 which is 10
So, interest will be Rs.10
And total amount to be payed will be 100+10 which is Rs.110