Problem $1$: Creating and Accessing Dictionaries

Create a dictionary named with the following key$-$value pairs:

'Alice': $88$

'Bob': $72$

'Charlie': $90$

'Diana': $85$

Access the grade for 'Bob' from the dictionary and print it out.

Problem $2$: Updating Dictionary Content

Given the dictionary 'product$\_$prices', update the price of 'milk' to $1\mathrm{.}25$ and add a new item 'bread' with the price $1\mathrm{.}85.$

'product$\_$prices$`=\{\text{'}$eggs$\text{'}$: $2\mathrm{.}00,$ 'milk': $1\mathrm{.}10,$ 'cheese': $3\mathrm{.}50$