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Sajjad1994
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Quicker way to attempt first, is to assume total fund was 100 as we are asked to calculate percentage difference, so total amount becomes irrelevant. Then,

Amount invested in solar = ~28
Amount invested in corn = ~20

How much greater? (28-20)/20 = 8/20 = ~40

Only one option choice matches this approximation.

Faster way to attempt second is to pre-calculate,

No. of shares = ~46

Difference b/w cost-per-share = Total amount invested in gas shares/Total no. of gas shares - Total amount invested in oil shares/Total no. of oil share

(Total amount invested in gas shares - Total amount invested in oil shares)/46
(12000*19/100 - 12000*13/100)/46
(6*12000)/(46*100)
720/46
~15.6

Again only one choice is closest.
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let total be T,
for first drop down
28T-20T/20T x 100 = 40


second drop down,

(19.02-12.74)xT/45.9x100 = 16.5
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