REQUIRED; Use two consecutive years $(2021-2022)$ data for Zillow Group Inc $($Z$)$ to answer the following questions:

What is the company core business?

The main focus of Zillow Group Inc.$\text{'}$s operations lies within the realm of the real estate sector. At its core, Zillow Group Inc. specializes in delivering online marketplace services for residential real estate, encompassing buying, selling, renting, and financing properties. Zillow Group Inc.$\text{'}$s websites, like Zillow, Trulia, StreetEasy, and HotPads, give many tools to help people buy and sell houses. They help buyers and sellers make good choices about properties.

$2.$ What is the company business model?

Zillow Group Inc. runs online real estate platforms like Zillow, Trulia, StreetEasy, and HotPads. They offer tools for buying, selling, and renting homes, earning revenue from advertising, marketing, and direct sales. Their Premier Agent program connects agents with clients, and Zillow Offers streamlines property transactions. They also analyze market data for insights, Overall, Zillow Group's tech$-$driven model connects buyers, sellers, and agents, generating diverse revenue.

$3.$ What was the companvs cost of sales?

$4.$ What was the company's gross profit margin?

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Asnwer please question $3$ and $4$

Give me finals answers for them not the guide to solve it $..[$full specific answer$]$