Abdul invested his savings in two investment funds. the amount he invested in fund a was twice as much as the amount he invested in fund b. fund a returned a 8% profit and fund b returned a 2% profit. how much did he invest in fund b, if the total profit from the two funds together was s1800?

The amount he invested in Fund A was twice as much as the amount he invested in Fund B.

LEt x be the amount invested  in Fund B

The amount invested in Fund A is 2x

Fund A returned a 8% profit  

Profit amount for fund A is  2x * 8% = 2x * 0.08= 0.16x

Fund B returned a 2% profit  

Profit amount for fund B is  x * 2% = x * 0.02= 0.02x

total profit from the two funds together was S1800

Profit fund A + profit fund B = 1800

0.16x + 0.02x = 1800

0.18x = 1800

Divide by 0.18 from both sides

x = 10000

he invest $10,000 in Fund B

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

the answer is c)8

step-by-step explanaction: