By selling a drone for N690, a profit of 15% was made. What was the cost price of the drone?

N688.97

Step-by-step explanation:

Percentage profit = [Selling price - Cost price/Cost price ]× 100

Percentage profit = 15%

Cost price = x = ??

Selling price = N690

Hence:

15% = (690 - x /x)× 100

0.15 = 100(690 - x)/x

Cross Multiply

0.15x = 69000 - 100x

Collect like terms

0.15x + 100x = 69000

100.15x = 69000

x = 69000/100.15

x = 688.96655017.

Approximately = 688.97

Therefore, the Cost price of the drone = x = N688.97

a

step-by-step explanation:

a

-3

step-by-step explanation:

a drawing really does here:

so i draw the horizontal line y=2 and the vertical line x=-2 at this intersection i put b (this is where my right angle is going to be).   so point b is at (-2,2).   point a is 5 units long and is also on y=2 so this point has to be (3,2) or (-7,2) -doesn't matter i will go with (3,2).

now we know c is at (-2,y) we don't know the y yet bet we know that c is on x=-2.

we have the area of the triangle is .5bh=12.5

we know the base length is 5 (ab)

we have the height is (2-y) if you look at your

plug in

.5(5)(2-y)=12.5

solve for y to get the y-coordinate for c

2.5(2-y)=12.5

divide both sides by 2.5 giving:

2-y=5

now subtract 2 on both sides

-y=3

y=-3