A phone sells for $700. It is now on sale for 1/5 off the
original price. Megan has a coupon for an extra 10% off the
sales price. To the nearest dollar, how much less than the
original price will Megan pay for the phone? (what is the
total discount) *

Step-by-step explanation:

If she is saving 1/5 of the original price, she is still paying 4/5, right?  So the cost of the phone on sale is 700(4/5) which is $560.  

She is then saving 10% on that sale price.  But if she is saving 10%, she is still paying 90%, right? So the final cost of the phone is 560(.90) = $504

To find the total discount, subtract the final cost from the original:

700 - 504 = $196