Answer:
a) $650
b) $3150
Explanation:
Simple interest:
To find the simple interest, multiply the principal amount (P), the rate of interest(r) and number of years (t).

a) P= $2500
r = 1.3% = 1.3 ÷ 100 = 0.013
t = 20 years
SI = 2500 * 0.013 * 20
= $650
Interest = $ 650
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b) To find the account balance after 20 years, add the amount invested with the interest.
Amount after 20 years = P + Interest
= 2500 + 650
= $3150
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