Question 1080251
1.{{{A+B=80000}}}
and
{{{0.07A+0.084B=6300}}}
2.{{{70A+84B=6300000}}}
From 1,
{{{70A+70B=5600000}}}
Subtract from 2 to eliminate A,
{{{70A+84B-70A-70B=6300000-5600000}}}
{{{14B=700000}}}
Solve for B, then use either equation to solve for A.