rakes produced Nov - Feb = 4x
rakes shipped ever month Mar -Oct = x/2
total rakes produced - total rakes shipped = 4x - 8x/2 = 0
This means no rakes were left after october.
4x - x/2 = 7x/2 = 7x/2 * .10 = .35x
7x/2 - x/2 = 6x/2 = .30x
6x/2 - x/2 = 5x/2 = 25x
5x/2 - x/2 = 4x/2 = .20x
Now you can identify the pattern with a difference of 0.05, till the final term i.e. 0
35+30+25+20+15+10+5+0 = 140
Total cost = 1.40x
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