Read the text and answer the question.
The family, which consists of mom, dad, grandpa and grandmom decided to make a common gift for Yulia on her birthday.
How many dollars did grandfather give for the present, if mom's contribution was 10500 dollars, dad gave twice as much as mom did, grandma gave \(\frac{1}{5}\) of mom and dad's contribution, and grandpa made \(\frac{2}{3}\) of grandmother's sums.

• 4200
• 3900
• 5600
• 4150