Let x = number of students in each of the remaining rows
266 = (10 x 20) + (5 x 8) + 2x
266 - (10 x 20) - (5 x 8) = 2x
266 - 200 - 40 = 2x
26 = 2x
x = 26/2
x = 13
I'm sending you two screenshots of the explanation I hope this helps.
U call it keep change change. keep 15.7. change it to subtract and change -3.45 to just 3.45 (positive not negative)
I=Prt
I=500*0.02*4
I=$40
So, basically the answer is $40.
