Non-inverting operational amplifier Bandwidth
Voltage Gain


First compute the voltage gain, which is equal:

$$A_V = 1+ \cfrac{R_2}{R_1}$$

In your case the R_2 = 150k and R_1 is 50k!

Hence 

$$A_V = 1+\cfrac{150k}{50k} = 4$$


Bandwidth


For bandwidth compute 
$$\beta = \cfrac{R_1}{R_1 + R_2} = \cfrac{50k}{50k + 150k} = 0.25 $$

and you get the bandwidth with:

$$f_B = \beta \cdot f_t \, ,$$

where f_t is the transit frequency of your opamp! 

For a 741 as I remember it is typical 1 MHz; look at your data sheet!  

$$f_B = 0.25 \cdot 1\mathrm{MHz} = 250\, \mathrm{kHz}\, .$$