man deposits Rs 3200 at 5% interest per annum. In how many years will he earn a simple interest of Rs 800?

5 years

Step-by-step explanation:

3200 × 5%= 160

800÷160=5

5 years

Step-by-step explanation:

Year= x

3200 X x 5 / 100= 800

160x = 800

x= 800/160

x= 5

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3. parallelogram

step-by-step explanation:

we turn each of our sides into direction vectors

ab=b-a=(3 - 7, 1 - 0) = (-4, 1)

bc=c-b=(1,6)

cd=d-c=(4,-1)

da=a-d=(-1,-6)

we see how the opposite sides have negated direction vectors; this is characteristic of a parallelogram.   we have congruent sides ab=cd and bc=da with unequal lengths because 1^2+6^2 is different from (-4)^2+1^2.   so it's not a square or a rhombus.  

we check the dot product of direction vectors of adjacent sides.   we have

ab dot bc = -4(1) + 1(6) = 2

that's not zero so the sides are not perpendicular.   we've ruled out rectangle.

the direction vectors indicate two pairs of congruent parallel sides, so we choose parallelogram over trapezoid.

x + 4/7

step-by-step explanation:

use cymath