O you know that N/N0 = .48 and k=.00001 (and e=2.718) Your equation becomes: .48 = 2.718*(.00001*t) NOTE: you probably mean<span>.48=(2.718<span>)<span>.00001t</span></span></span>
You know that d = 100 and w = 125, so you plug that into the equation and solve as shown: b= 100 + d - w = 100 + 100 - 125 = 200 - 125 = $75 You now have $75 left as balance.
