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Amount of $3000$ zlotys was paid to bank $A$ for interest-bearing investment of $p\mathrm{\%}$ per year. Amount $4000$ zlotys was paid to bank $B$, where the interest rate is by $2$ percentage points higher than in bank $A$. After one year, the interest earned in both banks amounted to $360$ zlotys. What was the interest rate $p$?