A+B = (1.99+2.98+3.97+...+99.1)+(1.101+2.102+3.103+...+99.199)
A+B = (1.99+1.101)+(2.98+2.102)+(3.97+3.103)+...+(99.1+99.199)
A+B = 1(99+101) + 2(98+102) + 3(97.103)+...+99(1+199)
A+B = 1.200 + 2.200 + 3.200 +...+ 99.200
A+B = 200.(1+2+3+...+200)
A+B = 200.4950
A+B = 990000