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A company dealing with finance gives 15% simple interest on deposits made by senior citizens. Illustrate by a graph the relation between the deposit and the interest gained. Use the graph to complete the following.

  1. The annual interest obtainable for investment of ₹ 450
  2. The amount a senior citizen has to invest to get an annual simple interest of ₹ 100.

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Using the formula for calculating the simple interest, the following table of values is prepared.

These are the points to be plotted in the graph sheet, let us take the deposits along x – axis and annual simple interest along y – axis.
We choose the scale as follows.

Then we plot the points and draw the straight line.
From the graph we find.

  1. Corresponding to ₹ 450 on the x – axis, we get the interest as ₹ 67.5 on the y – axis.
  2. Corresponding to ₹ 100 on the y – axis we get the deposit as ₹ 666 on the x – axis.

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