what will be the difference between simple and compound interest at 14 % per annum on a sum of rs. 1000 after 4 years? Options.
A) 129  B) 130  C) 124  D) 133  E) 145
<gadget id="calculator">14 / 100</gadget>
<output>7/50 = around 0.14</output>

<gadget id="calculator">(7/50) + 1</gadget>
<output>57/50 = around 1.14</output>

<gadget id="calculator">(57/50) ** 4</gadget>
<output>10_556_001/6_250_000 = around 1.68896</output>

<gadget id="calculator">1_000 * (10_556_001/6_250_000)</gadget>
<output>10_556_001/6_250 = around 1_688.96016</output>

<gadget id="calculator">(10_556_001/6_250) - 1_000</gadget>
<output>4_306_001/6_250 = around 688.96016</output>

<gadget id="calculator">1_000 * (7/50)</gadget>
<output>140</output>

<gadget id="calculator">140 * 4</gadget>
<output>560</output>

<gadget id="calculator">(4_306_001/6_250) - 560</gadget>
<output>806_001/6_250 = around 128.96016</output>

<result>A</result>
what will be the difference between simple and compound interest at 14 % per annum on a sum of rs. 1000 after 4 years?
subtract(subtract(multiply(1000, power(add(divide(14, const_100), const_1), 4)), 1000), multiply(multiply(1000, divide(14, const_100)), 4))
"s . i . = ( 1000 * 14 * 4 ) / 100 = rs . 560 c . i . = [ 1000 * ( 1 + 14 / 100 ) 4 - 1000 ] = rs . 689 difference = ( 689 - 560 ) = rs . 129 answer : a"