Question : Z is increased successively by $11 \frac{1}{9}$% and 10% to get R. If R = 165, then what is the value of Z?
Option 1: 145
Option 2: 115
Option 3: 125
Option 4: 135
Correct Answer: 135
Solution :
Increase = $11 \frac{1}{9}$% and 10%
Net increase = $\frac{100}{9} + 10 + \frac{100}{9}×\frac{10}{100}$ = $\frac{200}{9}$%
R = 165
So, Z + $\frac{200}{9}$% of Z = 165
⇒ $\frac{11}{9}$ × Z = 165
⇒ Z = $\frac{165×9}{11}$ = 15 × 9 = 135
Hence, the correct answer is 135.
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