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san4es73 [151]
3 years ago
12

Tony’s deposit earns SAR 45.80 in simple interest over 3 years in an account with an interest rate of 1.72%. How much did Tony d

eposit?
Mathematics
1 answer:
Nat2105 [25]3 years ago
5 0

Answer:

The answer is 500

Step-by-step explanation:

STEP 1: Convert interest rate of 2% per 6 months into rate per year.

                             rate per year = rate per 6 months x 2 = 2% x 2 = 4%

STEP 2: Convert 9 months into years.

                             9 months = 9/12 years = 0.75 years

STEP 3: Find principal by using the formula <em>I = P x i x t</em>, where<em> </em>I is interest, P is total principal, i is rate of interest per year, and t is total time in years.

In this example I = $15, i = 4% and t = 0.75 years, so

                                                                   <em>I = P x i x t</em>

<em>                                                                    P = I/i x t</em>

<em>                                                                    P = 15/0.04 x 0.75</em>

<em>                                                                    P = 500</em>

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