Suppose an investment of 1,700 double in value every 10 years. How much is the investment worth after 20 years?
If the investment doubles in value every 10 years, it means that the value is multiplied by 2 for every 10 years.
After 10 years, the investment would be worth 1,700 * 2 = $<<1700*2=3400>>3400.
After 20 years, the value would be doubled again, so the investment would be worth 3400 * 2 = $<<3400*2=6800>>6800. Answer: \boxed{6800}.