Selected financial data for Wilmington Corporation is presented below.

WILMINGTON CORPORATION Balance Sheet Dec. $31,$ Year $7$ Dec. $31,$ Year $6$ Current Assets Cash and cash equivalents $$634,527$ $$335,597$ Marketable securities $166,106187,064$ Accounts receivable $($net$)284,226318,010$ Inventories $466,942430,249$ Prepaid expenses $60,90628,060$ Other current assets $83,05385,029$ Total Current Assets $1,695,7601,384,009$ Property, plant and equipment $1,384,217625,421$ Long$-$term investment $568,003425,000$ Total Assets $$3,647,980$ $$2,434,430$ Current Liabilities Short$-$term borrowings $$306,376$ $$170,419$ Current portion of long$-$term debt $155,000168,000$ Accounts payable $279,522314,883$ Accrued liabilities $301,024183,681$ Income taxes payable $107,509196,802$ Total Current Liabilities $1,149,4311,033,785$ Long$-$term debt $500,000300,000$ Deferred income taxes $236,519288,644$ Total Liabilities $1,885,9501,622,429$ Common stock $$425,250$ $$125,000$ Additional paid$-$in capital $356,450344,335$ Retained earnings $980,330342,666$ Total Stockholders' Equity $1,762,030812,001$ Total Liabilities and Stockholders' Equity $$3,647,980$ $$2,434,430$

Selected Income Statement Data for the year ending December $31,$ Year $7$ Net sales $$4,885,340$ Cost of goods sold $(2,906,526)$ Selling expenses $(884,685)$ Operating income $1,094,129$ Interest expense $(55,240)$ Earnings before income taxes $1,038,889$ Income tax expense $(401,225)$ Net income $$637,664$

Selected Statement of Cash Flow Data for the year ending December $31,$ Year $7$ Cash flows from operations $$1,601,692$ Capital expenditures $$745,862$

Required

What was Wilmington Corporation$$s return on net operating assets $($RNOA$)$ in Year $7?$ Assume a statutory tax rate of $37\%.$

Select one:

a$.72\mathrm{.}4\%$

b$.52\mathrm{.}2\%$

c$.74\mathrm{.}6\%$

d$.47\mathrm{.}2\%$