f=2/7t
f+4=2/5(t-10)
2/5(t-10)-4=2/7t
1/5t-1/7t=4
2t=240
t=120 an therefor f=40
Which gives a total of 440$
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f=2/7t
f+4=2/5(t-10)
2/5(t-10)-4=2/7t
1/5t-1/7t=4
2t=240
t=120 an therefor f=40
Which gives a total of 440$