This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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Q. The Compound interest of certain for first and Second year is Rs. 20 and Rs. 23 respectively. Find the rate of interest in P.C.P.A. Step 1: Identify the compound interest for the first year (CI_1) and the second year (CI_2). CI_1 = Rs. 20 CI_2 = Rs. 23 Step 2: Calculate the additional interest earned in the second year. This additional interest is the interest earned on the first year's interest. Additional Interest = CI_2 - CI_1 = 23 - 20 = Rs. 3 Step 3: Consider the first year's compound interest (CI_1) as the principal for calculating the additional interest. The time period for this additional interest is 1 year. Principal (P) = Rs. 20 Interest (I) = Rs. 3 Time (T) = 1 year Step 4: Use the simple interest formula I = (P × R × T)/(100) to find the rate of interest (R). 3 = (20 × R × 1)/(100) Step 5: Solve for R. 3 = (20R)/(100) 3 = (R)/(5) Multiply both sides by 5: R = 3 × 5 R = 15 The rate of interest is 15% per annum. The final answer is 15\% P.C.P.A.. That's 2 down. 3 left today — send the next one.