Questions: a) El monto del ahorro por año. b) La tasa promedio de crecimiento del ahorro en los tres años. c) El porcentaje promedio de crecimiento del ahorro.

To solve the given questions, we need to follow these steps:

a) To calculate the amount of savings per year, we need to know the initial amount and the growth rate or any other relevant data provided.

b) To find the average growth rate of savings over three years, we can use the formula for the average annual growth rate, which involves the initial and final amounts.

c) To calculate the average percentage growth of savings, we can use the formula for percentage growth over the period and then average it over the three years.

El monto del ahorro por año se calcula como:

\[ \text{savings\_per\_year} = \frac{\text{final\_amount} - \text{initial\_amount}}{\text{years}} = \frac{1500 - 1000}{3} = 166.67 \]

La tasa promedio de crecimiento del ahorro se determina utilizando la fórmula:

\[ \text{average\_growth\_rate} = \left( \frac{\text{final\_amount}}{\text{initial\_amount}} \right)^{\frac{1}{\text{years}}} - 1 = \left( \frac{1500}{1000} \right)^{\frac{1}{3}} - 1 \approx 0.1447 \]

El porcentaje promedio de crecimiento del ahorro se obtiene multiplicando la tasa promedio de crecimiento por 100:

\[ \text{average\_percentage\_growth} = \text{average\_growth\_rate} \times 100 \approx 14.47 \]

\[ \text{a) } \boxed{166.67} \\ \text{b) } \boxed{0.1447} \\ \text{c) } \boxed{14.47} \]