Use the simple interest formula to determine the missing value. $$ p=\$ 1775, \mathrm{r}=?, \mathrm{t}=4 \text { years, } \mathrm{i}=\$ 127.80 $$ $$ \mathrm{r}=\square \% $$ (Do not round until the final answer. Then round to one decimal place as needed.)

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We start with the simple interest formula:
$$
i = p \times \frac{r}{100} \times t
$$
Substitute the known values:
$$
127.80 = 1775 \times \frac{r}{100} \times 4
$$
Multiply $$1775$$ by $$4$$:
$$
127.80 = 7100 \times \frac{r}{100}
$$
Solve for $$\frac{r}{100}$$ by dividing both sides by $$7100$$:
$$
\frac{r}{100} = \frac{127.80}{7100}
$$
Now multiply both sides by $$100$$ to isolate $$r$$:
$$
r = 100 \times \frac{127.80}{7100}
$$
Compute the expression:
$$
r = \frac{12780}{7100} = 1.8
$$
Thus, the interest rate is:
$$
r = 1.8\%
$$
The interest rate $$ r $$ is $$ 1.8\% $$.

Use the simple interest formula to determine the missing value. \[ p=\$ 1775, \mathrm{r}=?, \mathrm{t}=4 \text { years, } \mathrm{i}=\$ 127.80 \] \( \mathrm{r}=\square \% \) (Do not round until the final answer. Then round to one decimal place as needed.)

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