Years Ended
Dec 28,
Dec 29,
Dec 30,
(In Millions)
2019
2018
2017
Ongoing mark-to market adjustments on marketable equity securities
$277
$(129)
$ —
Observable price adjustments on non-marketable equity securities
293
202
—
Impairment charges
(122)
(424)
(833)
Sale of equity investments and other
1,091
226
3,484
Gains (losses) one equity investments, net
$1,539
$(125)
$2,651
Interest and other, net
$484
$126
$(349)

text: GAINS (LOSSES) ON EQUITY INVESTMENTS AND INTEREST AND OTHER, NET
text: GAINS (LOSSES) ON EQUITY INVESTMENTS, NET
text: Ongoing mark-to-market net gains and losses reported in 2019 and 2018 were primarily driven by ASML Holding N.V. (ASML) and Cloudera Inc. (Cloudera). During 2019 we sold our equity investment in ASML.
text: In 2019, we recognized $293 million in observable price adjustments primarily from one investment.
text: During 2018, we recognized an impairment charge of $290 million in our equity method investment in IMFT. During 2017, we recognized impairment charges in our investments of Cloudera for $278 million and Unisoc for $308 million.
text: Major drivers of sales of equity investments and other in 2019 were dividends of $632 million from McAfee and a gain of $107 million from our sale of our non-controlling interest in IMFT. In 2017, we recognized $3.4 billion in realized gains on sales of a portion of our interest in ASML.
text: INTEREST AND OTHER, NET
text: We recognized a higher net gain in interest and other in 2019 compared to 2018, primarily due to lower loss on debt conversions and larger divestiture gains in 2019 compared to 2018.
text: We recognized a net gain in interest and other in 2018 compared to a net loss in 2017, primarily due to lower losses on debt conversions, higher assets under construction resulting in more capitalized interest, and larger divestiture gains in 2018 compared to 2017.

Questions:
question: What were the main drivers for the net gains and losses in ongoing mark-to-market in 2019 and 2018?
answer: Ongoing mark-to-market net gains and losses reported in 2019 and 2018 were primarily driven by ASML Holding N.V. (ASML) and Cloudera Inc. (Cloudera).
question: What were the main reasons for a higher net gain in interest and other in 2019 compared to 2018?
answer: Higher net gain in interest and other in 2019 compared to 2018, primarily due to lower loss on debt conversions and larger divestiture gains in 2019 compared to 2018.
question: What were the main reasons for a net gain in interest and other in 2018 compared to a net loss in 2017?
answer: A net gain in interest and other in 2018 compared to a net loss in 2017, primarily due to lower losses on debt conversions, higher assets under construction resulting in more capitalized interest, and larger divestiture gains in 2018 compared to 2017.
question: What is the proportion of equity method investment in IMFT in impairment charge in 2018?
answer: 68.4
derivation: 290 / 424
scale: percent
question: What is the proportion of dividends from McAfee in sales of equity investments and other in 2019?
answer: 57.93
derivation: 632 / 1,091
scale: percent
question: What is the percentage change in gains (losses) on equity investments, net from 2017 to 2019?
answer: -41.95
derivation: (1,539 - 2,651) / 2,651
scale: percent