Question 163292
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1st customer:
{{{5MP+8HP=840}}} ----------------------> eqn 1
In eqn 1 we get,
{{{HP+(840-5MP)/8}}} -------------------> eqn 2
2nd customer:
{{{3MP+4HP=480}}} ----------------------> eqn 3
Subst. eqn 2 in eqn 3:
{{{3MP+cross(4)1((840-5MP)/cross(8)2)=480}}}
{{{3MP+((840-5MP)/2)=480}}}, get LCD
{{{(6MP+840-5MP)/2=480}}}, cross multiply
{{{6MP-5MP=2*480-840=960-840=120}}}
{{{MP=120/ea}}}, cost of a MP3
Via eqn 2:
{{{HP=(840-5*120)/8=(840-600)/8=240/8}}}
{{{HP=30/ea}}}, cost of Headphone set
In doubt? GO back eqn 3:
{{{3*120+4*30=480}}}
{{{360+120=480}}}
{{{480=480}}}
Go back eqn 1:
{{{5*120+8*30=840}}}
{{{600+240=840}}}
{{{840=840}}}
Thank you,
Jojo</pre>