HEL Investors buy a studio apartment for 140,000. Of this amount, they have a down payment of 42,000. Their down payment is what percent of the purchase price? What percent of the purchase price would a $49,000 down payment be? BTW im in middle school

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.

This is about circle theorems. someone asap : (

Yo need asap pls ! markin da brainiest too !