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Question

Suppose a person deposits Rs.10,000 in a bank for a simple interest at the rate of 7% per annum. Obtain a relation for accrued interest in terms of years. Draw the graph of this relation. Use this to read the interest at the end of 10 years.

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Solution

Let y be the interest obtained in x years. The interest for x years is 7100×10000×x=700x. Thus you get y=700x as the required relation. Now use the scaling; 1 unit=700 along y-axis. Note that
for x=1, you get y=700: (x,y)=(1,700) .
for x=2, you get y=1400: (x,y)=(2,1400)
Take a sheet of graph paper and set up coordinate axes XOXYOY
Locate points P(1,700) and Q(2,1400).
Remember you are using the scale 1 unit =700 along y-axis. Now the equation is a straight-line and hence P,Q determine this straight-line.

602927_558009_ans_d0486480fa6b4a5cb2defb4ce5f5f528.png

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