Data Sufficiency

Joern and Bin went on a year-long round-the-world backpacking tour starting January 1. Five days before the trip, each had opened a bank account. Then their insurance companies started to withdraw $300 from their accounts, respectively, on the first business day of each month. Assuming no other deposits or withdrawals, whose account had more money in it at the end of the year of travels?

(1) On April 15 during the tour, Bin's account had twice as much money as Joern's account.

(2) On June 15 during the tour, Bin's account had four times as much money as Joern's account.

The OA is the option _D_

Source: Manhattan GMAT

Insurance company deducts $300 per month.
Statement 1: On April 15 during the tour, Bin's account twice as much money as Joern's account.
Let;
Joern's account = $10,000
Bin's account = $10,000 * 2 = $20,000
Insurance deducts = $300 * 4 months = $1,200
Joern's balance = $10,000 - $1,200 = $8,800
Bin's balance = $20,000 - $1,200 = $18,800. Bin's account had more money.
Therefore, statement 1 is SUFFICIENT.

Statement 2: On June 15, during the tour, Bin's account had four times as Joern's account.
Let;
Joern's account = $10,000
Bin's account = $10,000 * 4 = $40,000
Insurance deducts = $300 * 6 months = $1,800
Joern's balance = $10,000 - $1,800 = $8,200
Bill's balance = $40,000 - $1,800 = $18,200. Bin's account had more money. Hence, statement 2 is SUFFICIENT.

In conclusion, both statements alone are SUFFICIENT.
Answer = option D