There is a solution **A** of \(\SI{150}{\milli\liter}\) with 30% acidity. What should be the acidity concentration (in %) of solution **B** to be added to solution **A** so the resulting solution **C** will be \(\SI{1}{\liter}\) and 50% acidity? Round the answer to the nearest percent.

**Tip.** Use the following table for your help:

Solution A\(\hspace{10mm}\) | Solution B\(\hspace{10mm}\) | Solution C\(\hspace{10mm}\) | |

Volume\(\hspace{10mm}\) | \(\SI{150}{\milli\liter}\) | ? | \(\SI{1}{\liter}\) |

Acidity % | 30% | ? | 50% |

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