Question

Nora orders a bowl of Tom Yam soup at a restaurant which offers a 15% discount.
The marked price of the Tom Yam soup is $6.90. Given that there is a service
charge of 10% and CST is at 7%, find the total amount of money she has to pay.

plz answer this question
i cannot understand it!​

Answer 1

6.90(15%) = $5.86
Soup cost with 15% discount is $5.86
Now add 10% to $5.86
5.86+.59= $6.45
Now add 7% to 6.45
6.90