You have agreed to loan some money to a friend at a simple interest rate of $120\%$ which is outrageous but still

about half of the payday loan places! To make it easy on your friend who needs a $$520$ loan to tide him over

for a bit you tell him to pay you back $$600$ in a few weeks.

In how many weeks should you tell him to pay you back if you want to hold that interest rate of $120\%?$

Note: $52$ weeks $=1$ year

$($nearest $1$ week$)$