If $x = 30 %$ of 30 and $y = x^{2} + 4 x + 7$ ,
then y = ___.

142

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134

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143

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124

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Solution

The correct option is D 124
$x = 30 % of 30 = \frac{30}{100} \times 30 = 9$

Substituting, $x = 9$ in $y = x^{2} + 4 x + 7$ , we get

$y = (9)^{2} + 4 (9) + 7 = 124$

$∴$ $y = 124$

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