You have the following number given in the exercise:
![47,502](https://img.qammunity.org/2023/formulas/mathematics/college/yk8jyuxgve45it2p58aveu40r3dxurvkxl.png)
According to the information given in the exercise, the digit 4 (located in the ten thousands place) was changed to a 7. Then now it is:
![77,502](https://img.qammunity.org/2023/formulas/mathematics/college/ernynp85602tv0j3z9dhg2acsgraz4stai.png)
In order to find how much the value would change, you must find the difference (the difference, by definition, is the result of a subtraction).
In this case, knowing the value of the digits, you can set up the following subtraction:
![70,000-40,0000](https://img.qammunity.org/2023/formulas/mathematics/college/dtoizxttmgbll35k1emqchq15kzvysie4k.png)
Solving the subtraction, you get the following difference:
![=30,000](https://img.qammunity.org/2023/formulas/mathematics/college/d9qwkj1tp5breo0mfrwck0eah4ljby6lhu.png)
Therefore, the answer is:
![30,000](https://img.qammunity.org/2023/formulas/mathematics/high-school/dtfy5mrgjmyieciw28jjtxh3o28ns8o49l.png)