Petra deposits 278.16 in a savings account that earns 2.1% simple interest. What is Petra’s account balance after nine years

The answer is $330.73.

Step-by-step explanation:

The answer is $330.73.

Step 1. Calculate simple interest: I = ?

Step 2. To get account balance add simple interest to the principal amount:

I + P = ?

Step 1. Calculate simple interest.

I = P * r * t

P - principal

r - rate

t - time period

We have:

P = $278.16

r = 2.1% = 2.1/100 = 0.021

t = 9

I = 278.16 * 0.021 * 9 = 52.57

Step 2. To get account balance add simple interest to the principal amount:

I + P = ?

52.57 + 278.16 = 330.73

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116