The present value is
100(1.08)-1 +
100(1.08)-2 +
100(1.08)-3 +
200(1.08)-4 +
300(1.08)-5 +
500(1.08)-6 =
((((((500/1.08)+300)/1.08+200)/1.08+100)/1.08+100)/1.08+100)/1.08 =
$923.98
100(1.08)-1 +
100(1.08)-2 +
100(1.08)-3 +
200(1.08)-4 +
300(1.08)-5 +
500(1.08)-6 =
((((((500/1.08)+300)/1.08+200)/1.08+100)/1.08+100)/1.08+100)/1.08 =
$923.98