x & gt=400/ 13
a = 1600 x+200000 & gt; =( 1600*400/ 13)+200000
a & gt=3240000/ 13
a & lt= 6c(c >; =0)
c & gt=540000/ 13
y & lt= 15
The final answer is x=3 1, a=249600, c=4 1850, y= 15.