Jamal placed two orders with an internet clothing store. The first order was 13 ties (t) and 4 pairs of suspenders (s), and tota
led $487. The second order was for 6 ties and 2 pairs of suspenders, and totaled $232. The bill does not list per-term price, but all ties have the same price and all suspenders have the same price
S = a*((1 - r^(n+1))/(1-r))
S = 1*((1 - 2^(7+1))/(1-2))
S = 1*((1 - 2^8)/(1-2))
S = 1*((1 - 256)/(1-2))
S = 1*((-255)/(-1))
S = 255
So 1+2+4+8+...+128 = 255
