$35.00 x .20 = $7
So the discount would be $7 off of $35, for a final sale price of $28
It already is rounded to the tenths
.1 is tenth
84= 7(6+a)
84= 42 +7a
84-42= 42-42 +7a
42= 7a
42/7= 7a/7
6= a
-84= -6( p+6)
-84= -6p -36
-84+36= -6p -36+36
-48= -6p
-48/-6= -6p/-6
8 =p
