99/19+99/19*2+99/19*3..+99/19*10=
=99/19(1+1/2+1/3...1/10)
=99/19[(1+1/2+1/4+1/8)+(1/5+/10)+(1/3+1/6+1/9)+1/7]
=99/19(15/8+3/10+11/18+1/7)
=99/19(87/40+95/126)
=730719/47880