Mary borrowed $21,500 to buy a truck for her business. She borrowed from her parents who charge her 3% simple interest. She borrowed from a credit union that charges 5% simple interest, and she borrowed from a bank that charges 6% simple interest. She borrowed four times as much from her parents as from the bank, and the amount of interest she paid at the end of 1 yr was $865 . How much did she borrow from each source?

the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950

b, i believe, but not sure.