```
cf1=[-200,50,60,70,100,50]
f=1.06
pv=0
for i in range(6):
pv += cf1[i] / f**[i+1]
print(pv)
```

GIVES ME A WIERD ERROR:

```
TypeError Traceback (most recent call last)
<ipython-input-80-c3095863493f> in <module>
1 pv=0
2 for i in range(6):
----> 3 pv += cf1[i] / f1**[i+1]
4 print(pv)
TypeError: unsupported operand type(s) for ** or pow(): 'float' and 'list'
```