You are offered three investments. The first ensures you will earn 19% annually, the second will earn 18.5% compounded quarterly, and the third will earn 17% compounded weekly. Which would be the best investment?

It depends on length of investment:

Take for 10 years investment:

Balance of accounts after 10 yeras

1st

A= 1000 ( 1+ 10(0.19) ) = 2900

2nd

A = 1000( 1 + 0.185/4) ^( 10* 4) = 6101.26

3rd

A = 1000 ( 1 + 0.17/52) ^520=5458. 80

For 10 years investment 2nd one is the best( highest Yield)