pvikas wrote:

please sir bunuel provide explanation how the ans is d.

I think

"If the amount that Leo invested at c percent annual interest and the amount that he invested at d percent annual interest earned $30 in interest for that year" means each of the amounts are getting an interest of $30.

If yes, then We can simply use each of the statements alone to find the total amount.

We know 1000*c*1/100 = 30, we can find out c=3.

Also, let total amount is X.

We can say (X-1000) * d*1/100 = 30.

Now, as per statement 1, we know c-d=1. We have the value of c, this would give us teh value of D and which in turn when substituted to equation above will give X.

Same goes for statement 2.

Hence, D

Please correct me if I am missing anything.

_________________

My GMAT Story: From V21 to V40

My MBA Journey: My 10 years long MBA Dream

My Secret Hacks: Best way to use GMATClub | Importance of an Error Log!

Verbal Resources: All SC Resources at one place | All CR Resources at one place

Blog: Subscribe to Question of the Day Blog

GMAT Club Inbuilt Error Log Functionality - View More.

New Visa Forum - Ask all your Visa Related Questions - here.

New! Best Reply Functionality on GMAT Club!

Find a bug in the new email templates and get rewarded with

2 weeks of GMATClub Tests for free