Grade for Class 7 Assignment

Good job, Sonam.

- Study the changes provided
- The `# your code here` comments are meant to be replaced with real code.  :smile: 

#### Exercise 1

- No crashes, works as expected. 4 points
- Some of the parenthesis are unnecessary
- Perhaps it's a good idea to have all arabic numbers to roman numerals? :stuck_out_tongue_winking_eye: 

#### Exercise 2

- No crashes, works as expected. 4 points

#### Exercise 3

- No crashes, works as expected. 4 points
- When returning `nil`, it's good to be explicit

#### Exercise 4

- No crashes, works as expected. 4 points
- The `self.` receiver is implied

#### Exercise 5

- No crashes, works as expected. 4 points

#### Total

`4 + 4 + 4 + 4 + 4 = 20` :star2: